In Fruit Flies, an X-Linked Dominant Mutant Allele of the Notch

question 30

Multiple Choice

In fruit flies, an X-linked dominant mutant allele of the Notch gene (N) causes Notched wings in heterozygous females but is lethal in hemizygous or homozygous condition.What ratio of offspring would be observed in a cross of a Notched-wing female with a normal male?

• A)1/3 Notched-wing females, 1/3 normal females, 1/3 normal males
• B)1/4 Notched-wing females, 1/4 normal females, 1/4 Notched-wing males, 1/4 normal males
• C)1/2 Notched-wing females, 1/2 normal males
• D)1/2 normal females, 1/2 Notched-wing males
• E)2/3 Notched-wing females, 1/3 normal males

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Definitions:

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Traditional costs associated with environmental management, including prevention, detection, and remediation of environmental damage.

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