In squash plants, the allele for yellow fruit (y) is dominant to the allele for green fruit (y). a plant with genotype yy is crossed with a plant with genotype yy.

what are the expected genotype percentages in the offspring of this cross?

question options:

a)

100% heterozygous and 0% homozygous

b)

50% homozygous dominant and 50% heterozygous

c)

50% homozygous dominant and 50% homozygous recessive

d)

25% homozygous dominant, 50% heterozygous, and 25% homozygous recessive

Y - yellow

y - green fruit

P:             YY                    x                  Yy

G:                    Y               x               Y        y

F1: YY, Yy

F=1

G=1:1

All offspring are a yellow

                   Y                  y

Y                YY                  Yy

the right answer is B)   50% homozygous dominant and 50% heterozygous.

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.