You Are Studying Two Linked Genes in Lizards

question 44

Multiple Choice

You are studying two linked genes in lizards.You have two females and you know that both are the same genotype, heterozygous for both genes (A/a and B/b) .You test-cross each female to a male that is fully homozygous recessive for both genes (a/a and b/b) and get the following progeny with the following phenotypes: How can you explain the drastic difference between these two crosses?

• A)The two genes are assorting independently in female 1 and are linked in female 2.
• B)The two genes are linked in female 1 and are assorting independently in female 2.
• C)The two alleles are in the coupling configuration in female 1 but in the repulsion configuration in female 2.
• D)The two alleles are in the repulsion configuration in female 1 but in the coupling configuration in female 2.
• E)The two genes are likely located on a sex chromosome in female 1 and are likely located on an autosome in female 2.

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Definitions:

Eardrum

A thin membrane that separates the outer ear from the middle ear, vibrating in response to sound waves.

Incus

A small anvil-shaped bone in the middle ear that helps transmit sound vibrations from the outer ear to the inner ear.

Chronic Serous

Refers to a prolonged fluid-producing (serous) inflammation or effusion, often seen in certain medical conditions.

Otitis Media

An infection or inflammation of the middle ear.