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Quiz about Testcross your Mendelian knowledge

Test-cross your Mendelian knowledge Quiz

This quiz involves a lot of hypothetical cross situations, so grab your big L's and your little l's and let's get started! Note: This quiz is about Mendel's genetic principles, but does not require any information of Mendel's life or experiments.

A multiple-choice quiz by KevinL75. Estimated time: 4 mins.

Author
KevinL75

Time
4 mins

Type
Multiple Choice

Quiz #
106,107

Updated
Dec 03 21

# Qns
10

Difficulty
Average

Avg Score
6 / 10

Plays
1363

One at a Time - Single Page - Timed Game

Question 1 of 10

1. When crossing a homozygous recessive individual (all recessive genes) for a trait with a homozygous dominant individual (all dominant genes) for that same trait, the resulting offspring will all be genotypically heterozygous (containing both dominant and recessive genes) for that trait.

True

False

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Question 2 of 10

2. Plant A is red, and plant B is white. All the plants produced by crossbreeding plants A and B are pink, which is an example of what? Hint

Dominant trait

Dihybrid cross

Incomplete dominance

Purebred

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Question 3 of 10

3. Dd x Dd theoretically yields what percentage of homozygous offspring? (Hint: 100% - percent of heterozygous offspring) Hint

25%

70%

50%

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Question 4 of 10

4. True or False: If two traits are controlled by genes on two different chromosomes, they can be linked. (If one gene is expressed, the other is expressed also)

True

False

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Question 5 of 10

5. Which of the following is an example of co-dominance? Hint

Human Blood Type

Girls with three X chromosomes

Pink Roses

People with Trisomy 21

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Question 6 of 10

6. What is the name for a chart of a family that traces gene expression through several generations? Hint

Karyotype

Pedigree

Phenotype

Widow's Peak

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Question 7 of 10

7. True or False: If an allele is dominant, it will subdue any recessive alleles present at the level of the DNA.

True

False

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Question 8 of 10

8. Polygenic inheritance occurs when several genes control one phenotypic characteristic. Which of the following can be categorized as an example of polygenic inheritance? Hint

Pink roses

Different shades of skin color

Human blood type

Different species of finches

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Question 9 of 10

9. The opposite of polygenetic inheritance is pleiotropy. Pleiotropy occurs when one allele has an effect on more than one phenotypic characteristic. Which of the following can be categorized as pleiotropic? Hint

Contracting Huntington's Disease

Skin Pigmentation

Different conditions resulting from a Sickle-Cell condition

Stripes on Zebras

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Question 10 of 10

10. Allele W controls smoothness in peas, and the dominant allele codes for smooth peas. If a pea is wrinkled, and one of its parents had a genotype Ww (heterozygous), which of the following statements is true about its other parent? Hint

It could have been smooth or wrinkled

It was wrinkled

It was smooth

It had more than one recessive allele

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Quiz Answer Key and Fun Facts

Answer: True

For example, when is a person is homozygous dominant for brown eyes (BB) and they mate with a person who is homozygour recessibe (bb) all of the offspring will have brown eyes (because brown is the dominant allele) and their genotypes will all be Bb.

2. Plant A is red, and plant B is white. All the plants produced by crossbreeding plants A and B are pink, which is an example of what?

Answer: Incomplete dominance

This is an example of incomplete dominance, where neither the red nor the white plant dominates the other, producing crosses which are a mixture of both - pink. Purebred refers to cross producing identical plants, a dihybrid cross needs more than one difference (e.g. number of pets as well) and a dominant trait means that most of the plants will resemble that plant.

3. Dd x Dd theoretically yields what percentage of homozygous offspring? (Hint: 100% - percent of heterozygous offspring)

Answer: 50%

25% are homozygous dominant, and 25% are homozygous recessive. The combined percent of homozygous zygotes is 50%! This problem can also be solved by knowing that 50% are heterozygous, and that the rest are homozygous: 100% - 50% = 50%.

4. True or False: If two traits are controlled by genes on two different chromosomes, they can be linked. (If one gene is expressed, the other is expressed also)

Answer: False

If the genes are close enough together on the same chromosome, the traits that the genes control are linked. An example of this is red hair and freckles.

5. Which of the following is an example of co-dominance?

Answer: Human Blood Type

Co-dominance is when two dominant traits are dominant together. In humans, both A and B type blood are dominant, and since they are co-dominant, people can have type AB blood.

6. What is the name for a chart of a family that traces gene expression through several generations?

Answer: Pedigree

A pedigree can be used to trace the origin of a disease running through a family, and can help determine the chances of offspring contracting the disease. Scientists have used a pedigree, combined with molecular biological techniques, to test for the presence of the dominant allele that causes Huntington's Disease.

7. True or False: If an allele is dominant, it will subdue any recessive alleles present at the level of the DNA.

Answer: False

The dominant/recessive relationship is only noticable on the outside (phenotypic expression only.) The dominant alleles suppress the recessive alleles on a genotypic level.

8. Polygenic inheritance occurs when several genes control one phenotypic characteristic. Which of the following can be categorized as an example of polygenic inheritance?

Answer: Different shades of skin color

Since different alleles affect a single phenotypic characteristic, there are more allelic combinations possible. This is why humans have such varied skin color.

Answer: Different conditions resulting from a Sickle-Cell condition

When an individual has a sickle-cell condition, it causes other problems in that individual such as spleen damage, heart failure, brain damage, and paralysis.

Answer: It could have been smooth or wrinkled

If the second parent was a hybrid (Ww) it would have been smooth, but its offspring still could have been wrinkled (ww). If the second parent was wrinkled (ww) then the offspring could also have been wrinkled. Ww x Ww = 25% ww. Ww x ww = 50% ww.

Source: Author KevinL75

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