Question

PROBLEM 1. INCOMPLETE DOMINANCE AND CODOMINANCE. You are studying leaf development in a member of the mustard family. You identify several mutants of Interest in this plant and make pure-breeding lines of each mutant for further study A. You conduct a genetic analysis of these mutant lines by crossing each with a pure-breeding wild-type (WT) line. The number of progeny in each phenotypic class of the Fy is indicated. twist WT 53 18 WT 49 16 pale WT (light green) 17 light WT pale 34 16 From these results, identify the relationship (a-d) between the mutant allele and its corresponding wild-type allele in each line. The mutant allele twist is t The mutant allele forked is to its corresponding WT allele. The mutant allele pale is to c to its corresponding WT allele. a. completely dominant. b. incompletely dominant c. codominant. d. recessive. to its corresponding WT allele. B. You next cross the pure-breeding forked and pale mutant lines with each other. The leaves of the Fi are light green and forked. The F2 has six phenotypic classes (a-f), as shown below. In the box under each plant, identify the genotype of each F2 class using the following designations: F, forked allele; f, WT; and p, palke allele; P, WT. HINT: Remember the dominance relationships identified in part A.

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Answer 1

Answer. A) The mutant allele twist is completely dominant to the corresponding WT allele. Because in F1 generation only twist plant appears. And in F2 generation there is 3:1 of twist and WT.

The mutant allele forked is completely dominant to the corresponding WT allele because in F1 only forked plants appears and in F2 generation 3:1

The mutant allele pale is incomplete dominant to the corresponding WT allele. Because they show an incomplete or intermediate.

Answer B. The genotype of a = FFPP

b genotype = FfPp

c genotype = FFpp

d genotype = ffPP

e genotype = ffPp

F genotype = ffpp

Answer C) the forked mutation and the twist mutation are codominant allele of the same locus.

genotype of a = F^Tf

Genotype of b = Ff

Genotype of c = F F^T