Chapter 12 (1.5 points) 1. Assume that the genes for seed color and seed shape a

Question

Chapter 12 (1.5 points) 1. Assume that the genes for seed color and seed shape are both located on chromosome 1. A plant heterozygous for both genes is test-crossed to a plant with the recessive phenotypes wrinkled & green producing the following offspring:green wrinkled: 645 green round: 36 yellow round: 590 yellow wrinkled: 29 Draw diagrams of the two copies of chromosome 1 for each parent. present on the same copy of chromosome l. Make sure you indicate which alleles are What is the map distance between the two genes on chromosome 1?

Explanation / Answer

Answer:

Hint: Recombinant phenotypes are smalle in number. So recombinants are green, round and yellow, wrinkled.

Yellow= Y; Green = y

Round = R; Wrinkled = r

YR/yr-- heterozygous parent genotype.

Yr/yr--Tester parent genotype.

Recombination frequency = RF= (no. of recombinant progeny/ Total progeny) 100

= (65/1300)100

= 5%

RF (5%)= Distance between gene (mu)

Map distance between the two genes on chromosomes 1 = 5 mu

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