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:

Occipital Lobe

The occipital lobe is the region of the brain located at the back of the head, responsible for processing visual information.

Cerebral Cortex

The external surface of the cerebrum within the brain, crucial for functions such as memory, attention, perception, awareness, thinking, language, and consciousness.

Corpus Callosum

The large band of neural fibers connecting the two brain hemispheres and carrying messages between them.

Interpreter

A professional who translates spoken or sign language into another language, facilitating communication between individuals who do not share a common language.