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BIO 335- UNCW Genetics Test- Questions with 100% Correct Answers
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BIO 335- UNCW Genetics Test-Questions with 100% Correct Answers
Imagine in nettles that there is a gene encoding plant height (T = tall; t = short) and a
gene encoding the number of stinging hairs present on the plant (H = many stinging
hairs; h = few stinging hairs). A true-breeding tall nettle with many stinging hairs is
crossed to a short nettle with few stinging hairs. The resulting F1 plants are crossed to
a short nettle with few stinging hairs. The following F2 offspring are generated:
177 tall, many stinging hairs
198 short, few stinging hairs
10 tall, few stinging ha - Answer 180 tall, many stinging hairs, 180 short, few
stinging hairs, 20 tall, few stinging hairs, 20 short, many stinging hairs
The next 2 questions pertain to the following setup: The stinging nettle is a flowering
plant with a history of use as medicine for humans. The leaves and stems are very hairy
with both stinging and non-stinging hairs. When contacted by humans and other
animals, the tips of the stinging hairs break off, and the hair is transformed into a
needle that injects chemicals that cause a stinging/burning sensation.
Imagine in nettles that there is a gene encoding plant height (T = tall; t = short) and a
gene encoding the number of stinging hairs present on the plant (H = many stinging
hairs; h = few stinging hairs). A true-breeding tall nettle with many stinging hairs is
crossed to a short nettle with few stinging hairs. The resulting F1 plants are crossed to
a short nettle with few stinging hairs. The following F2 offspring are generated:
177 tall, many stinging hairs
198 short, few stinging hairs
, 10 tall, few stinging ha - Answer Chi square value for 8.1 , so p-value p< 0.05
You are performing a fruit fly cross similar to those that Morgan performed.
Unfortunately, you forgot to write down the parents of your cross. You count the
progeny, and find you have 40 red-eyed males, 80 red-eyed females, and 40 white-eyed
males. Assuming that all genotypes from this cross should have equal survival rates,
what are the genotypes of the parent flies? - Answer Xw+Y and Xw+Xw
Hemophilia is a sex-linked recessive condition that results in deficient blood clotting.
The disease causes excessive bleeding, which occurs spontaneously or upon slight injury.
In dogs (as in humans) hemophilia is caused by a defect in a gene on the X chromosome.
What will be the results of mating between a normal, non-carrier female dog and a male
dog with hemophilia? - Answer All of the offspring will be normal, but all females will be
carriers.
The next 2 questions pertain to the following scenario: A scientist is studying an animal and
determines that a gene is located on autosome #2. The wild type allele is responsible for
antler production in the male animals and a recessive mutation prevents antler production.
Females of this species never produce antlers. A male with antlers is bred to a
heterozygous female and produced male offspring with and without antlers.
What is the most likely inheritance mode of this trait? - Answer Sex-limited trait
This question still pertains to the following scenario: A scientist is studying an animal and
determines that a gene is located on autosome #2. The wild type allele is responsible for
antler production in the male animals and a recessive mutation prevents antler production.
Females of this species never produce antlers. A male with antlers is bred to a
heterozygous female and produced male offspring with and without antlers.
In the cross from the previous question what is the probability that the first offspring
is a male without antlers. - Answer 1/8
This is the last question that pertains to the following setup: The stinging nettle is a
flowering plant with a history of use as medicine for humans. The leaves and stems are
very hairy with both stinging and non-stinging hairs. When contacted by humans and
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