First slide

Inheritance of Two Genes

Question

Observe the following diagram related to genotype of Drosophila and what is the phenotype of the organism.

Easy

A

It is female with yellow body and red eyes.
B

It is female with yellow body and white eyes
C

It is male with yellow body and red eyes
D

It is male with Brown body and red eyes

Solution

The figure shows that both chromosomes are X chromosomes because Y chromosome is hook like at one of the ends. The genotype is yy $w^{+}$ w. it shows that the body of the female Drosophila is yellow colored and eye color is heterozygous with one dominant allele for red eyes as $w^{+}$ . It is $F_{2}$ recombinant among the females in dihybrid cross with respect to body and eye color.

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