White fruit color in summer squash is influenced by
a dominant allele W, whereas colored fruit must be
ww. In the presence of ww, a dominant gene G
results in yellow fruit, and if the individual had both
recessive genes in the homozygous condition, it
would be green. Give the F2 phenotypic ratios
resulting from a cross of a pure-breeding white of
genotype WW GG with a green. What will be an ideal response?
Question 2Congenital deafness in humans is due to the
homozygous condition of either of the recessive
genes d or e, or both of these genes. Both dominant
D and E are necessary for normal hearing. Gene D/d
affects the middle ear, while gene E/e affects the
inner ear. It does not matter how good the normal
inner ear (as indicated by E__) is; if there is
something wrong in the middle ear, the individual is
unable to hear. The same applies for the other gene.
Give the phenotypic results of the following crosses:
(a) Dd EE x Dd EE
(b) Dd Ee x Dd Ee
(c) dd EE x DD ee
(d) Dd EE x Dd ee
(e) Dd EE x DD Ee What will be an ideal response?