Genetic Variation Test
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Genetic Variation and DNA Test
Questions and Answers
- 1.
All human BODY CELLS contain this many chromosomes
- A.
23
- B.
46
- C.
8
- D.
45
Correct Answer
B. 46Explanation
The correct answer is 46. This is because each human body cell contains 23 pairs of chromosomes, for a total of 46 chromosomes. Chromosomes are thread-like structures that contain DNA and carry genetic information. They are found in the nucleus of every cell in the body, except for red blood cells.Rate this question:
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- 2.
Each GAMETE contains this many chromosomes as a body cell
- A.
Twice as many
- B.
Half as many
- C.
The same amount
- D.
1/3 as many
Correct Answer
B. Half as manyExplanation
Gametes are reproductive cells, such as sperm and eggs, which are produced through a process called meiosis. During meiosis, the number of chromosomes in a cell is halved. This is because gametes are haploid, meaning they contain only one set of chromosomes, while body cells are diploid, containing two sets of chromosomes. Therefore, the correct answer is "half as many" chromosomes in gametes compared to body cells.Rate this question:
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- 3.
Sperm cells and egg cells are examples of
- A.
Body cells
- B.
Meiosis
- C.
Gametes
- D.
DNA
Correct Answer
C. GametesExplanation
Sperm cells and egg cells are examples of gametes. Gametes are reproductive cells that are involved in sexual reproduction. They are responsible for transmitting genetic information from one generation to the next. Sperm cells are produced by males, while egg cells are produced by females. Through a process called fertilization, a sperm cell and an egg cell combine to form a zygote, which eventually develops into a new organism.Rate this question:
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- 4.
The name of the large molecule contained in chromosomes is called
- A.
RNA
- B.
DEA
- C.
DVD
- D.
DNA
Correct Answer
D. DNAExplanation
DNA, or deoxyribonucleic acid, is the correct answer. DNA is a large molecule that is contained in chromosomes and carries the genetic information of an organism. It is responsible for transmitting hereditary traits from one generation to the next. RNA, DEA, and DVD are not correct answers as they do not accurately describe the large molecule contained in chromosomes.Rate this question:
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- 5.
What does a DNA structure look like?
- A.
A twisted ladder
- B.
A braided rope
- C.
A long stick
- D.
A twizzler
Correct Answer
A. A twisted ladderExplanation
A DNA structure is often described as a twisted ladder because it consists of two strands that are twisted around each other in a double helix shape. The ladder-like structure is formed by the pairing of nucleotides, which are the building blocks of DNA, and the twisting of the strands creates a stable and compact structure. This twisted ladder shape allows for the storage and replication of genetic information within the DNA molecule.Rate this question:
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- 6.
Where are chromosomes located inside the cell?
- A.
The ribosome
- B.
The nuclear membrane
- C.
The cell wall
- D.
The nucleus
Correct Answer
D. The nucleusExplanation
Chromosomes are located inside the nucleus of a cell. The nucleus is the control center of the cell and contains the genetic material, including chromosomes. The chromosomes are thread-like structures that carry the DNA and genes, which are responsible for determining the traits and characteristics of an organism. The nucleus is surrounded by a nuclear membrane, which acts as a protective barrier for the chromosomes and other contents of the nucleus. Therefore, the correct answer is the nucleus.Rate this question:
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- 7.
Different versions of the same gene are known as
- A.
Centromeres
- B.
Alleles
- C.
Chromosomes
- D.
Gametes
Correct Answer
B. AllelesExplanation
Alleles are different versions or variants of the same gene. They are alternative forms of a gene that can occupy the same position on a chromosome. Each individual inherits two alleles for each gene, one from each parent. These alleles can be the same (homozygous) or different (heterozygous), and they determine the traits and characteristics of an organism. Therefore, alleles are the correct answer as they represent the different versions of a gene.Rate this question:
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- 8.
Heterozygous means
- A.
Having two of the same genes for a certain trait
- B.
Having a zygous that is hetero
- C.
Having two genes for a trait that are different
- D.
None of the above
Correct Answer
C. Having two genes for a trait that are differentExplanation
The correct answer is "having two genes for a trait that are different." Heterozygous refers to an individual having two different alleles (gene variants) for a specific trait. In genetics, individuals inherit one allele from each parent, and if these alleles differ, the individual is said to be heterozygous for that trait. This is in contrast to homozygous, where an individual has two identical alleles for a trait.Rate this question:
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- 9.
Having two of the same genes for a certain trait is called
- A.
Heterozygous
- B.
Homozanious
- C.
The same
- D.
Homozygous
Correct Answer
D. HomozygousExplanation
Homozygous refers to the condition where an individual has two identical genes for a particular trait. It means that both alleles for the gene are the same. In this case, having two of the same genes for a certain trait is correctly called homozygous.Rate this question:
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- 10.
The type of gene that always shows itself is called a
- A.
Powerful gene
- B.
Dominant gene
- C.
Homozygous gene
- D.
Recessive gene
Correct Answer
B. Dominant geneExplanation
A dominant gene is a type of gene that always shows itself in the phenotype of an organism, even if it is paired with a different allele. This means that if an organism has one dominant allele and one recessive allele for a particular trait, the dominant allele will determine the physical expression of that trait. In contrast, a recessive gene only shows itself when paired with another recessive allele. Homozygous genes refer to having two identical alleles for a particular gene, which can be either dominant or recessive.Rate this question:
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- 11.
A chart that shows the possible gene combinations is called a
- A.
A gene symbol
- B.
Karyotype
- C.
A Punnett Sguare
- D.
A pie chart
Correct Answer
C. A Punnett SguareExplanation
A Punnett Square is a chart used to predict the possible gene combinations that can result from a genetic cross between two individuals. It is commonly used in genetics to determine the probability of certain traits being passed on to offspring. The Punnett Square displays the different combinations of alleles from each parent, allowing scientists to understand the potential outcomes of genetic crosses.Rate this question:
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- 12.
Genes for a trait that are hidden when the dominant gene is present are called
- A.
A wimpy gene
- B.
Heterozygous
- C.
Recessitative jeans
- D.
Recessive gene
Correct Answer
D. Recessive geneExplanation
Genes for a trait that are hidden when the dominant gene is present are called recessive genes. These genes are only expressed when an individual has two copies of the recessive gene, one from each parent. In the presence of a dominant gene, the recessive gene is masked and does not contribute to the observable traits of an individual. However, if both parents carry a recessive gene, they can pass it on to their offspring, and if both copies are inherited, the recessive trait will be expressed.Rate this question:
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- 13.
What are the chances of an offspring being a boy or a girl?
- A.
25%
- B.
33%
- C.
50%
- D.
75%
Correct Answer
C. 50%Explanation
The chances of an offspring being a boy or a girl are 50% because the probability of having a boy or a girl is equal. In humans, the sex of a child is determined by the combination of chromosomes inherited from the parents. The father contributes either an X or a Y chromosome, while the mother always contributes an X chromosome. If the father's sperm carrying an X chromosome fertilizes the mother's egg, the offspring will be a girl (XX). If the father's sperm carrying a Y chromosome fertilizes the egg, the offspring will be a boy (XY). Since there are an equal number of sperm carrying X and Y chromosomes, the chances of having a boy or a girl are 50%.Rate this question:
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- 14.
When traits from the parents blend together in the offspring, it is called
- A.
Codominance
- B.
Incomplete dominance
- C.
Complete dominance
- D.
A goofy looking offspring
Correct Answer
B. Incomplete dominanceExplanation
Incomplete dominance occurs when traits from both parents blend together in the offspring, resulting in an intermediate phenotype that is different from both parents. In this case, neither trait is dominant over the other, and the offspring displays a combination of both traits. This is different from complete dominance, where one trait is dominant and masks the expression of the other trait. The term "a goofy looking offspring" is not a scientific term and does not accurately describe incomplete dominance.Rate this question:
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- 15.
When alleles from each parent both appear in an offspring, it is called
- A.
Complete dominance
- B.
Codominance
- C.
Incomplete dominance
- D.
Coordination
Correct Answer
B. CodominanceExplanation
Codominance occurs when both alleles from each parent are fully expressed in the phenotype of the offspring. This means that neither allele is dominant or recessive, and both contribute to the observable traits. In codominance, the traits produced by each allele are distinct and can be seen simultaneously in the offspring. This is different from complete dominance, where one allele is dominant and masks the expression of the other allele, and incomplete dominance, where a blending or intermediate phenotype is observed. Coordination is not a term used in genetics to describe the expression of alleles.Rate this question:
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- 16.
A recessive gene always shows itself.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
This statement is false because a recessive gene is only expressed when an individual has two copies of that gene. If an individual has one dominant gene and one recessive gene, the dominant gene will be expressed, masking the recessive gene. Therefore, a recessive gene does not always show itself.Rate this question:
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- 17.
If the trait for the fur pattern on a dog were solid fur(f) and spotted fur(F), a homozygous female with solid fur and a homozygous male with spotted fur have a 25% chance of having an offspring with solid fur.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The given statement is false. If the trait for the fur pattern on a dog were solid fur (f) and spotted fur (F), a homozygous female with solid fur (ff) and a homozygous male with spotted fur (FF) will always produce offspring with a heterozygous genotype for fur pattern (Ff). Therefore, the chance of having an offspring with solid fur is 0%.Rate this question:
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- 18.
How many pairs of chromosomes are in a human body cell?
- A.
46
- B.
12
- C.
23
- D.
8
Correct Answer
C. 23Explanation
In a human body cell, there are 23 pairs of chromosomes. This is because humans have a total of 46 chromosomes, with each chromosome having a corresponding partner. These pairs of chromosomes contain the genetic information necessary for the development and functioning of the human body.Rate this question:
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- 19.
The gender of an offspring is determined by the _____________.
Correct Answer
male
mail
fatherExplanation
The gender of an offspring is determined by the combination of genetic material contributed by the male and female parents. The male parent provides the sperm, which carries either an X or Y chromosome, determining whether the offspring will be male or female. The female parent provides the egg, which always carries an X chromosome. When a sperm carrying an X chromosome fertilizes the egg, the offspring will be female, whereas if a sperm carrying a Y chromosome fertilizes the egg, the offspring will be male.Rate this question:
- 20.
Male organisms have
- A.
Two x chromosomes
- B.
Two y chromosomes
- C.
One x and one z chromosome
- D.
One x and one y chromosome
Correct Answer
D. One x and one y chromosomeExplanation
Male organisms have one X and one Y chromosome. This is because the sex determination system in humans is based on the presence of these chromosomes. Females have two X chromosomes (XX), while males have one X and one Y chromosome (XY). The presence of the Y chromosome determines the development of male characteristics during embryonic development. Therefore, the correct answer is one X and one Y chromosome.Rate this question:
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- 21.
When a woman has a gene for a disorder, but does not show any sign of that disorder, she is called a
- A.
Weirdo
- B.
Carrier
- C.
Hemophiliac
- D.
Sex-linked trait
Correct Answer
B. CarrierExplanation
When a woman has a gene for a disorder but does not exhibit any symptoms of that disorder, she is referred to as a "carrier." This means that although she does not personally experience the disorder, she can pass the gene on to her offspring, who may then develop the disorder. This term is commonly used in genetics to describe individuals who possess a particular gene but do not express the associated trait or condition.Rate this question:
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- 22.
Sex-linked traits are not passed through the x and y chromosomes.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Sex-linked traits are actually passed through the X and Y chromosomes. In humans, the X and Y chromosomes determine an individual's sex, with females having two X chromosomes (XX) and males having one X and one Y chromosome (XY). The genes located on the sex chromosomes can carry traits that are specific to one sex or the other. These traits are known as sex-linked traits. Examples of sex-linked traits include color blindness and hemophilia, which are more commonly found in males due to their inheritance from the X chromosome. Therefore, the statement that sex-linked traits are not passed through the X and Y chromosomes is false.Rate this question:
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- 23.
A larkey that is homozygous for red eyes(EE) mates with a larkey that is homozygous for gray eyes(ee). What percent chance will their offspring have gray eyes?
- A.
25%
- B.
50%
- C.
75%
- D.
None of the above
Correct Answer
D. None of the aboveExplanation
The given question involves a cross between a larkey with red eyes (homozygous for red eyes, EE) and a larkey with gray eyes (homozygous for gray eyes, ee). Since red eyes are dominant over gray eyes, the offspring will inherit one copy of the red eye allele from the red-eyed larkey. Therefore, none of the offspring will have gray eyes.Rate this question:
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- 24.
FF-striped fur, Ff- solid fur, ff- spotted fur Two larkeys with solid fur mate. Which fur will their offspring most likely have?
- A.
Striped
- B.
Solid
- C.
Spotted
Correct Answer
B. SolidExplanation
When two larkeys with solid fur mate, their offspring will most likely have solid fur as well. This is because solid fur is represented by the dominant allele (Ff), while striped fur is represented by the recessive allele (FF). Since both parents have solid fur, they must both carry the dominant allele, and therefore their offspring will inherit at least one dominant allele, resulting in solid fur.Rate this question:
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- 25.
A woman that is a carrier of colorblindness mates with a man that is colorblind. What percent chance will their offspring actually be colorblind?
- A.
25%
- B.
50%
- C.
75%
- D.
None of the above
Correct Answer
B. 50%Explanation
When a woman who carries the colorblindness gene mates with a colorblind man, there is a 50% chance that their offspring will be colorblind. This is because the woman is a carrier, meaning she has one normal gene and one colorblindness gene. The man, being colorblind, has two colorblindness genes. Therefore, there is a 50% chance that the offspring will inherit the colorblindness gene from either the mother or the father, resulting in them being colorblind.Rate this question:
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Feb 24, 2025Quiz Edited by
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Apr 20, 2011Quiz Created by
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