Comb Shape in Chickens Represents One of the Classic Examples

question 36

Short Answer

Comb shape in chickens represents one of the classic examples of gene interaction.Two gene pairs interact to influence the shape of the comb.The genes for rose comb (R)and pea comb (P)together produce walnut comb.The fully homozygous recessive condition (rrpp)produces the single comb.Assume that a rose-comb chicken is crossed with a walnut-comb chicken and the following offspring are produced: 17 walnut,16 rose,7 pea,6 single.
a) What are the probable genotypes of the parents?
b) Give the genotypes of each of the offspring classes.

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Definitions:

Proton Pump Inhibitors

Medications that reduce stomach acid production by blocking the enzyme in the stomach wall that produces acid.

Thyroid Hormone

Hormones produced by the thyroid gland, crucial for regulating metabolism, energy generation, and growth and development.

Erythema

A medical term referring to redness of the skin, often caused by increased blood flow to the affected area due to irritation, injury, or infection.

Bilirubin

A yellow compound that occurs in the normal catabolic pathway that breaks down heme in red blood cells, often measured to assess liver function.