Genetics Knowledge Trivia! 7th Grade Quiz

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Questions: 10 | Attempts: 410 | Updated: Oct 21, 2024

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Genetics Knowledge Trivia! 7th Grade Quiz - Quiz

What do you know about Genetics? Do you think you know a sufficient amount to pass this quiz? Genetics is the science of heredity, and it pertains to the differences and resemblances of different living organisms, which results from the interaction of their genes and the environment. It is the study of genes and explaining how they work. Take this test and find out how much you know about genetics.

Questions and Answers

1.

What percent of offspring will be heterozygous if both parents are heterozygous?
- A.
  
  0%
- B.
  
  25%
- C.
  
  50%
- D.
  
  75%
- E.
  
  100%
Correct Answer
C. 50%

Explanation
If both parents are heterozygous, it means that they have one dominant and one recessive allele for a particular trait. When they reproduce, each parent can pass on either the dominant or the recessive allele to their offspring. Since there are two possible alleles that can be passed on, and each parent can contribute one allele, there are four possible combinations for the offspring: dominant-dominant, dominant-recessive, recessive-dominant, and recessive-recessive. Out of these four combinations, two of them (dominant-recessive and recessive-dominant) result in heterozygous offspring. Therefore, 50% of the offspring will be heterozygous.

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1
2
2.

Which of these genotypes is an example of homozygous dominant?
- A.
  
  Bb
- B.
  
  Bb
- C.
  
  BB
Correct Answer
C. BB

Explanation
The genotype BB is an example of homozygous dominant because both alleles in the genotype are dominant (represented by the capital letter B), meaning that they will express their trait. Homozygous means that both alleles in the genotype are the same, in this case, both are dominant. Therefore, BB is an example of homozygous dominant.

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3.

Which is the easiest way to try and determine which trait is dominant in a species?
- A.
  
  See what trait is most common
- B.
  
  Extract and map the DNA (chromosomes)
- C.
  
  Breed 10 generations and see which traits show up the most
Correct Answer
A. See what trait is most common

Explanation
The easiest way to try and determine which trait is dominant in a species is to see what trait is most common. By observing the frequency of a particular trait in a population, we can infer that it is likely the dominant trait. This method does not require any complex scientific techniques or experiments, making it a simple and straightforward approach to determining dominance.

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4.

Which description is most accurate to describe how an albino axolotl can come from two wild-type axolotls?
- A.
  
  One parent is albino
- B.
  
  Both parents have to be heterozygous
- C.
  
  We can hope for a genetic mutation to occur
- D.
  
  Both parents are homozygous dominant
Correct Answer
B. Both parents have to be heterozygous

Explanation
If both parents are heterozygous, it means that they carry one copy of the albino gene and one copy of the wild-type gene. When these two parents reproduce, there is a chance that they will pass on the albino gene to their offspring, resulting in an albino axolotl. This is because the albino gene is recessive, meaning that it only manifests when an individual has two copies of the gene. Therefore, both parents need to carry the albino gene in order for there to be a possibility of producing an albino offspring.

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0
1
5.

Where is the genetic information stored in a cell?
- A.
  
  Nuclues
- B.
  
  Ribosomes
- C.
  
  Cell membrane
- D.
  
  Vacuole
Correct Answer
A. Nuclues

Explanation
The genetic information in a cell is stored in the nucleus. The nucleus contains the cell's DNA, which carries the instructions for the cell's functions and characteristics. The DNA is organized into chromosomes and is protected within the nucleus. The other options mentioned, such as ribosomes, cell membrane, and vacuole, do not store genetic information. Ribosomes are responsible for protein synthesis, the cell membrane is a protective barrier, and vacuoles store water and other substances.

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0
1
6.

What is the dominant phenotype for human eye color?
- A.
  
  BB
- B.
  
  Bb
- C.
  
  Brown
- D.
  
  Blue
Correct Answer
C. Brown

Explanation
The dominant phenotype for human eye color is brown. This means that if an individual has the genotype BB or Bb, they will have brown eyes. The presence of the dominant allele B overrides the recessive allele b, which is associated with blue eye color. Therefore, individuals with the genotype bb will have blue eyes.

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0
1
7.

Which of these genotypes is heterozygous?
- A.
  
  Bb
- B.
  
  BB
- C.
  
  Bb
- D.
  
  Brown
- E.
  
  Blue
Correct Answer
C. Bb

Explanation
The genotype Bb is heterozygous because it contains two different alleles, B and b. In genetics, heterozygous refers to an individual having two different alleles for a particular gene. In this case, Bb indicates that the individual has one dominant allele (B) and one recessive allele (b) for a specific trait.

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0
1
8.

Imagine you have offspring from a wild type axolotl and an albino axolotl. The offspring end up 100% wild type. What is the most likely genotype of the wild type axolotl?
- A.
  
  Bb
- B.
  
  BB
- C.
  
  Bb
Correct Answer
B. BB

Explanation
The most likely genotype of the wild type axolotl is BB. This is because the wild type phenotype is dominant, and if all the offspring are wild type, it means that they have received a dominant allele from both parents. Therefore, the wild type axolotl must have a homozygous dominant genotype (BB).

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9.

Imagine you have offspring from two albino axolotls. What is the only genotype that can occur?
- A.
  
  Bb
- B.
  
  Bb
- C.
  
  BB
- D.
  
  Albino
- E.
  
  Wild type
Correct Answer
A. Bb

Explanation
When two albino axolotls reproduce, they can only pass on the albino gene to their offspring. The genotype for the albino gene is represented by "bb". This means that the only possible genotype that can occur in the offspring is "bb".

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10.

Use a punnet square for your answer. What percent of offspring will be homozygous recessive if one parent is homozygous recessive and one parent is heterozygous?
- A.
  
  0%
- B.
  
  25%
- C.
  
  50%
- D.
  
  75%
- E.
  
  100%
Correct Answer
C. 50%

Explanation
When one parent is homozygous recessive (rr) and the other parent is heterozygous (Rr), the Punnett square can be used to determine the possible genotypes of their offspring. The possible combinations are Rr and rr, with a 50% chance of each. Since rr represents the homozygous recessive genotype, the percentage of offspring that will be homozygous recessive is 50%.

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Current Version
Oct 21, 2024

Quiz Edited by
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Feb 21, 2010

Quiz Created by
Randallh

Genetics Knowledge Trivia! 7th Grade Quiz

What percent of offspring will be heterozygous if both parents are heterozygous?

Which of these genotypes is an example of homozygous dominant?

Which is the easiest way to try and determine which trait is dominant in a species?

Which description is most accurate to describe how an albino axolotl can come from two wild-type axolotls?

Where is the genetic information stored in a cell?

What is the dominant phenotype for human eye color?

Which of these genotypes is heterozygous?

Imagine you have offspring from a wild type axolotl and an albino axolotl. The offspring end up 100% wild type. What is the most likely genotype of the wild type axolotl?

Imagine you have offspring from two albino axolotls. What is the only genotype that can occur?

Use a punnet square for your answer. What percent of offspring will be homozygous recessive if one parent is homozygous recessive and one parent is heterozygous?