The fly with vestigial wings shown in the lowerleft hand cor

The fly with vestigial wings shown in the lower-left hand corner of Figure 5.19 is crossed to the fly with normal wings shown in the upper-right hand corner of the figure. If the progeny are reared at 31°C, what percentage will have vestigial wings?

a) 100%

b) 75%

c) 50%

d) 25%

e) 0%

Hypospadias, a birth defect in male humans, results from an autosomal dominant gene in some families. Females can carry the gene but the gene never shows any phenotypic effects in females. This birth defect is an example of:

an X-linked trait.

a Y-linked trait.

a sex-limited trait.

a sex-influenced trait.

genetic maternal effect.

Solution

Please provide diagram for question 1.

Since the disease, Hypospadias, is related to the male sex organ, penis, so this disease can be considered as sex limited trait. Female does not have penis, so inspite of carrying gene for the disease hypospadias, they can not show the phenotypic symptoms of the disease.