Definition Of Genetics Quiz Questions

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Quizzes Created: 2 | Total Attempts: 1,543

Questions: 12 | Attempts: 305 | Updated: Mar 21, 2023

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Definition Of Genetics Quiz Questions - Quiz

Please do your best because you will only get one chance to pass. If you do not pass this quiz you will have to come back to your seat and do the section review from your textbook.

Questions and Answers

1.

A cross is made between two parents, both with genotype Aa. What is the probability that an offspring will have the genotype aa?
- A.
  
  1/4
- B.
  
  1/8
- C.
  
  1/2
Correct Answer
A. 1/4

Explanation
When two parents with genotype Aa are crossed, they can produce four possible genotypes in their offspring: AA, Aa, aA, and aa. Since the genotype aa is only one out of the four possible genotypes, the probability of an offspring having the genotype aa is 1/4.

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2.

In Guinea pigs, black hair is dominant over white hair. If a homozygous black guinea pig is crossed with a white guinea pig, the offspring will be:
- A.
  
  All white
- B.
  
  All black
- C.
  
  1/2 black and 1/2 white
Correct Answer
B. All black

Explanation
When a homozygous black guinea pig (BB) is crossed with a white guinea pig (bb), the genotype of the offspring will be heterozygous black (Bb). Since black hair is dominant over white hair, all the offspring will have black hair. Therefore, the correct answer is "All black."

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3.

A dominat trait is _____________________.
- A.
  
  Members of a gene pair that are different
- B.
  
  Physical appearance
- C.
  
  Expressed if present
Correct Answer
C. Expressed if present

Explanation
A dominant trait refers to a gene that is expressed and produces a specific characteristic or phenotype when it is present in an individual's genetic makeup. This means that even if there is only one copy of the dominant gene, it will override the presence of any recessive gene and be expressed in the physical appearance of the individual. The dominant trait is not dependent on the presence of other traits or the physical appearance, but rather on the expression of the gene itself.

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4.

A recessive trait is _______________________.
- A.
  
  Is masked by the dominant gene
- B.
  
  The letters used to indicate the presence of a gene
- C.
  
  Physical appearance
Correct Answer
A. Is masked by the dominant gene

Explanation
A recessive trait refers to a gene that is only expressed or visible when an individual inherits two copies of that gene, one from each parent. In the presence of a dominant gene, which is a gene that is always expressed or visible, the recessive gene is "masked" or not expressed. This means that the dominant gene takes precedence over the recessive gene, resulting in the dominant trait being observed instead of the recessive trait.

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5.

The genotype is ________________.
- A.
  
  Physical appearance
- B.
  
  The letters used to indicate the presence of a gene
- C.
  
  Masked by the dominant gene
Correct Answer
B. The letters used to indicate the presence of a gene

Explanation
The correct answer is "The letters used to indicate the presence of a gene". This is because in genetics, genotypes are represented by letters that indicate the presence of specific genes. Each letter represents a different allele or variant of a gene. By using letters, scientists can easily identify and communicate the different genotypes of individuals.

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6.

Heterozygous is __________________.
- A.
  
  Members of a gene pair that are different
- B.
  
  Members of a gene pair that are the same.
- C.
  
  The upper case alleles
Correct Answer
A. Members of a gene pair that are different

Explanation
Heterozygous refers to the condition where an individual has two different alleles for a particular gene. In this context, it specifically refers to the members of a gene pair that are different from each other. This means that the individual has inherited one allele from one parent and a different allele from the other parent for that specific gene.

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7.

Homozygous is _____________.
- A.
  
  The lower case alleles
- B.
  
  Members of a gene pair that are the same
- C.
  
  Members of a gene pair that are different
Correct Answer
B. Members of a gene pair that are the same

Explanation
Homozygous refers to the condition where an individual has two identical alleles for a particular gene. In other words, both members of the gene pair are the same. This condition is important in genetics as it determines the expression of certain traits and can influence the inheritance pattern of genetic disorders.

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8.

This individual carries the recessive trait but it is not apparent.
- A.
  
  Homozygous dominant
- B.
  
  Homozygous recessive
- C.
  
  Heterozygous
Correct Answer
C. Heterozygous

Explanation
The individual carries the recessive trait but it is not apparent, indicating that they have one dominant allele and one recessive allele. This makes them heterozygous, as they have different alleles for the trait.

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9.

What are the gametes of a parent with the genotype BbSs
- A.
  
  BB,BS,bs,Bs
- B.
  
  BS,Bs,bs,bs
- C.
  
  BS,Bs,bS,bs
Correct Answer
C. BS,Bs,bS,bs

Explanation
The gametes of a parent with the genotype BbSs would be BS, Bs, bS, and bs. This is because during meiosis, the parent's two alleles for each gene (B and b, S and s) segregate, resulting in four possible combinations of these alleles in the gametes.

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10.

In Mendel's garden peas, the tall allele (D) is dominant over the dwarf allele (d), and the green pod allele is dominant (Y) over the yellow pod allele (y). Using the symbols provided above, what is the genotype of a heterozygous tall, homozygous green pod pea plant?
- A.
  
  DdYy
- B.
  
  DDYy
- C.
  
  DdYY
Correct Answer
C. DdYY

Explanation
The genotype of a heterozygous tall, homozygous green pod pea plant is DdYY. This means that the plant has one dominant tall allele (D) and one recessive dwarf allele (d), as well as two dominant green pod alleles (Y). Since the tall allele is dominant over the dwarf allele, the plant will be tall. Similarly, since the green pod allele is dominant over the yellow pod allele, the plant will have green pods.

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11.

What is the probability of a coin landing on tails four times in a row?

Correct Answer
1/16

Explanation
The probability of a coin landing on tails four times in a row can be calculated by multiplying the probability of getting tails on each individual flip. Since the coin has two sides (heads and tails) and each flip is independent, the probability of getting tails on a single flip is 1/2. Therefore, the probability of getting tails four times in a row is (1/2) * (1/2) * (1/2) * (1/2) = 1/16.

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4
12.

What is the probability of rolling a six sided die and it landing on 2?

Correct Answer
1/6

Explanation
The probability of rolling a six-sided die and it landing on any specific number is 1 out of the total number of possible outcomes, which is 6. Therefore, the probability of rolling a two is 1 out of 6, or 1/6.

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4

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Current Version
Mar 21, 2023

Quiz Edited by
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Nov 19, 2009

Quiz Created by
Tarsha04

Definition Of Genetics Quiz Questions

A cross is made between two parents, both with genotype Aa. What is the probability that an offspring will have the genotype aa?

In Guinea pigs, black hair is dominant over white hair. If a homozygous black guinea pig is crossed with a white guinea pig, the offspring will be:

A dominat trait is _____________________.

A recessive trait is _______________________.

The genotype is ________________.

Heterozygous is __________________.

Homozygous is _____________.

This individual carries the recessive trait but it is not apparent.

What are the gametes of a parent with the genotype BbSs

In Mendel's garden peas, the tall allele (D) is dominant over the dwarf allele (d), and the green pod allele is dominant (Y) over the yellow pod allele (y). Using the symbols provided above, what is the genotype of a heterozygous tall, homozygous green pod pea plant?

What is the probability of a coin landing on tails four times in a row?

What is the probability of rolling a six sided die and it landing on 2?