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:

Excited State

A condition of an atom, molecule, or nucleus in which it possesses more energy than its ground state.

Electron

A subatomic particle with a negative charge, found in all atoms and acting as the primary carrier of electricity in solids.

Photon

A quantum of electromagnetic radiation that embodies the concept of light as both a particle and a wave.

Electron

A subatomic particle with a negative charge found in all atoms, contributing to electricity.