Fruit flies with one allele for curly wings (Cy) andone allele for normal wings (Cy+) have curly wings.When two curly-winged flies were crossed, 203curly-winged and 98 normal-winged flies wereobtained. In fact, all crosses between curly-wingedflies produce nearly the same curly : normal ratioamong the progeny.a. What is the approximate phenotypic ratio in theseoffspring?b. Suggest an explanation for these data.c. If a curly-winged fly was mated to a normalwinged fly, how many flies of each type would youexpect among 180 total offspring?

Human Anatomy & Physiology (11th Edition)
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Author:Elaine N. Marieb, Katja N. Hoehn
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Chapter1: The Human Body: An Orientation
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Fruit flies with one allele for curly wings (Cy) and
one allele for normal wings (Cy+) have curly wings.
When two curly-winged flies were crossed, 203
curly-winged and 98 normal-winged flies were
obtained. In fact, all crosses between curly-winged
flies produce nearly the same curly : normal ratio
among the progeny.
a. What is the approximate phenotypic ratio in these
offspring?
b. Suggest an explanation for these data.
c. If a curly-winged fly was mated to a normalwinged fly, how many flies of each type would you
expect among 180 total offspring?

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