A banded, yellow snail is crossed with a homozygous brown, unbanded snail. The F1 progeny are then crossed with banded, yellow snails in a testcross. Predict the percentage of progeny in each phenotype if the two genes are linked with no recombination, if the two genes assort independently, and if the genes are 20 m.u. apart. Place the percentage for each phenotype for each of the scenarios in the table. Percentages can be used more than once.

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
Section: Chapter Questions
Problem 36QP
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Question 5 of 18
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In the snail Cepaea nemoralis, an autosomal allele causing a banded shell, u, is recessive to the allele for an unbanded
shell, U. Genes at a different locus determine the background color of the shell. The allele for a yellow shell, b, is
recessive to the allele for a brown shell, B.
A banded, yellow snail is crossed with a homozygous brown, unbanded snail. The F1 progeny are then crossed with
banded, yellow snails in a testcross. Predict the percentage of progeny in each phenotype if the two genes are linked with
no recombination, if the two genes assort independently, and if the genes are 20 m.u. apart. Place the percentage for each
phenotype for each of the scenarios in the table. Percentages can be used more than once.
Linked,
no recombination
Phenotype
Independent
Genes 20 m.u.
assortment
apart
Brown, unbanded
Brown, banded
Yellow, unbanded
Yellow, banded
Answer Bank
0%
10%
40%
30%
25%
100%
60%
70%
90%
20%
80%
75%
50%
Transcribed Image Text:Question 5 of 18 <> In the snail Cepaea nemoralis, an autosomal allele causing a banded shell, u, is recessive to the allele for an unbanded shell, U. Genes at a different locus determine the background color of the shell. The allele for a yellow shell, b, is recessive to the allele for a brown shell, B. A banded, yellow snail is crossed with a homozygous brown, unbanded snail. The F1 progeny are then crossed with banded, yellow snails in a testcross. Predict the percentage of progeny in each phenotype if the two genes are linked with no recombination, if the two genes assort independently, and if the genes are 20 m.u. apart. Place the percentage for each phenotype for each of the scenarios in the table. Percentages can be used more than once. Linked, no recombination Phenotype Independent Genes 20 m.u. assortment apart Brown, unbanded Brown, banded Yellow, unbanded Yellow, banded Answer Bank 0% 10% 40% 30% 25% 100% 60% 70% 90% 20% 80% 75% 50%
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