Punnett Square Question?

Question

Two true-breeding pea plants are crossed, one with purple flowers and the other with white. Their offspring are what?
a. heterozygous with the dominant phenotype
b. homozygous with the recessive phenotype
c. a mixture of purple and white flowers with varying genotypes
d. still true-breeding, with the same parental genotypes

Answer 1

The term true breeding suggest that both parents are homozygous. One parent is homozygous dominant while the other is homozygous recessive- we don't know hich is which- But we do know the progeny will be 100 heterozygous.



......A ..............A

a Aa............. Aa

a Aa............ Aa

So the answer is a.

Answer 2

The definition of a true breeding plant is that it's homozygous (meaning PP or pp). Any time you cross two homozygous plants, you'll get the same result: four offspring, all of the dominant phenotype (meaning its physical appearance) but with heterozygous genotypes (meaning Pp).

Punnett square looks like this:

P P
p Pp Pp
p Pp Pp

some definitions for you:

homogygous- two allelles that are the same (homo means "same" in Latin)

heterozygous- two different allelles (hetero means different)

genotype: the allelles that the plant has (like PP, pp, or Pp).

phenotype: what the plant looks like (like white or purple).

Hope that helps!

Answer 3

c. a mixture of purple and white flowers with varying genotypes
I think....

Answer 4

A. If they are both homozygous