Genetic cross with dependent assortment (linked traits). Repeat the previous problem but assume that the genes are located very close to each other on the same chromosome, and are therefore always linked (passed on

Human Heredity: Principles and Issues (MindTap Course List)
11th Edition
ISBN:9781305251052
Author:Michael Cummings
Publisher:Michael Cummings
Chapter3: Transmission Of Genes From Generation To Generation
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Problem 18QP: More Crosses with Pea Plants: The Principle of Independent Assortment Determine the possible...
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  1. Genetic cross with dependent assortment (linked traits). Repeat the previous problem but assume that the genes are located very close to each other on the same chromosome, and are therefore always linked (passed on together). Assume that in these individuals, each chromosome contains the dominant allele for one gene and the recessive allele for the other gene. Note: this is similar to the dependent assortment example in your notes, but the linkage is different. Construct a 2x2 Punnett square, and answer the questions below:

GgBb x GgBb

 

 

 

GB

Gb

gB

gb

GB

GGBB

GGBb

GgBB

GgBb

Gb

GGBb

GGbb

GgBb

Ggbb

gB

GgBB

GgBb

ggBB

ggBb

gb

GgBb

Ggbb

ggBb

ggbb

 

  1. a) From your Punnett square, how many individuals are dihybrids?

 

 

  1. b) How many individuals are both homozygous recessive for coat color and heterozygous for eye color (ggBb)?

 

 

  1. c) Fill in the blanks to state the expected phenotypic ratio of the offspring:

 

                  ___  Gray coat, brown eyes :  ___Gray coat, blue eyes   : ___ Black coat, brown eyes : ____ Black coat, blue eyes

please Construct a 2x2 Punnett square

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