In a Species of Drosophila,genes Q and R Are Found

question 8

Multiple Choice

In a species of Drosophila,genes q and r are found on the same chromosome 20 centimorgans apart.A cross was made between the following individuals: What proportion of the offspring would you expect to have the wild-type phenotype?

• A)0.10
• B)0.20
• C)0.40
• D)0.80
• E)None of these

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Definitions:

Epimers

Stereoisomers that differ in configuration at only one stereogenic center among several.

D-Arabinose

A naturally occurring pentose sugar, which is a component of many polysaccharides and glycoproteins.

D-Xylose

A sugar molecule classified as an aldopentose, which means it has five carbon atoms and contains an aldehyde functional group.

Haworth Structure

A way of representing cyclic sugars that emphasizes their ring structure, useful in carbohydrate chemistry.