In fruit flies, the autosomal recessive mutation pr causes brown eyes whereas the cn mutation causes bright-red eyes (again autosomal recessive). When both mutations are homozygous in the individual (double mutant; pr-cn combination), it causes orange eyes. Wild-type flies have red eyes. It is known that these genes are found on the same chromosome.
In fruit flies, the autosomal recessive mutation pr causes brown eyes whereas the cn mutation causes bright-red eyes (again autosomal recessive). When both mutations are homozygous in the individual (double mutant; pr-cn combination), it causes orange eyes. Wild-type flies have red eyes. It is known that these genes are found on the same chromosome.
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 fruit flies, the autosomal recessive mutation pr causes brown eyes whereas the cn mutation causes bright-red eyes (again
autosomal recessive). When both mutations are homozygous in the individual (double mutant; pr-cn combination), it causes
orange eyes. Wild-type flies have red eyes. It is known that these genes are found on the same chromosome.
Scenario:
A female who has wild-type eyes is crossed to an orange eyed male. Their progeny have the following distribution of eye colors:
wild-type
23
brown
220
bright-red 230
orange
27
Total 500
What is the genotype of the mother of these progeny?
O pr-cn/pr*-cn*
O pr*-cn/pr*-cn
O pr*-cn/pr-cn*
O pr-cn*/pr-cn*
O pr-cn/pr-cn
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