In some plants a red pigment is synthesized from a colorless precursor by a single enzyme...

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Biology

In some plants a red pigment is synthesized from a colorlessprecursor by a single enzyme coded for by gene A. The red pigmentcan be changed into a purple pigment by another enzyme coded for bygene B. A cross between pure-breeding purple plants and whiteplants with the resulting F₂:
94 purple
31 red
43 white
A.Give a concise genetic hypothesis for inheritance of flowercolor from these results (include number of genes, number ofalleles, and the relations between genes and alleles).
B.Using symbols A and B to correspond to genes A and B asdescribed above symbolize the genotypes and their ratios for eachF₂ phenotypic class.
C.If the F₁ is used in a testcross, what phenotypicratio would you expect in the progeny?

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4.4 Ratings (661 Votes)

This pattern of gene interaction given in the question typically represents recessive epistasis let us assume that A is for purple B for red and ab for whitein case of recessive epistasis b will be epistatic over A Dominant A will express in presence of B but in the See Answer

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