Biology Practice Problems Extensions to Mendel Practice Problems Solution: Flower colour in a plant species is determined by ...

🤓 Based on our data, we think this question is relevant for Professor McCleary's class at USF.

Solution: Flower colour in a plant species is determined by two genes, gene B and gene P. The gene products of these genes are enzymes that convert a white substrate to an intermediate blue substrate and then to the final purple product.This series of conversions are shown in a simplified pathway below.A. What is the phenotype of the following genotypes (white, blue, or purple)     1. BbPp     2. BBpp     3. bbPP     4. bbppB. If you cross two dihybrids together, what proportion of the progeny will be:     1. white              2. blue              3. PurpleC. If you test cross a dihybrid, what proportion of the progeny will be:     1. white              2. blue              3. Purple

Problem

Flower colour in a plant species is determined by two genes, gene B and gene P. The gene products of these genes are enzymes that convert a white substrate to an intermediate blue substrate and then to the final purple product.

This series of conversions are shown in a simplified pathway below.

A. What is the phenotype of the following genotypes (white, blue, or purple)

     1. BbPp

     2. BBpp

     3. bbPP

     4. bbpp

B. If you cross two dihybrids together, what proportion of the progeny will be:

     1. white              2. blue              3. Purple

C. If you test cross a dihybrid, what proportion of the progeny will be:

     1. white              2. blue              3. Purple


Solution

From the given problem, it can be seen that the dominant character of the B allele gives color to the flowers. In addition to this, the dominant character of the P allele modifies the default blue color to purple. Thus, a recessive p allele will simply leave the flower color to blue while a recessive B allele will leave it as plain white, despite the presence of a dominant P.

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