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.
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 Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Transcribed Image Text: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.
Phenotype
Brown, unbanded
Brown, banded
Yellow, unbanded
Yellow, banded
80%
50%
100%
Linked,
Independent
no recombination assortment
25%
10%
Answer Bank
75%
90%
60%
70%
20%
Genes 20 m.u.
apart
40%
30%
0%
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