Purple flowers are dominant over white flowers. a heterozygous purple flower is crossed with another heterozygous purple flower. the ratio of purple to white would be

3:1

Explanation:

Let's say that A is purple (dominant) and a is white (recessive). Then the genotype of a heterozygous purple flower is Aa.

If we draw up a punnet square for a cross between two purple heterozygous flowers, we get:

A. a.

A. AA Aa

a. Aa aa

Thus, the resulting offspring genotypes would be AA, Aa, Aa, aa.

Since purple is dominant to white, then homozygous dominant (AA) or heterozygous (Aa) flowers will be purple. Homozygous recessive flowers (aa) will be white.

There are three purple flowers (AA, Aa, Aa) and one white flower (aa), therefor the ratio of purple to white would be 3:1

The answer is 3:1

Your Welcome! :D

there are 35 white marbles

step-by-step explanation:

y- yellow marbles

4y + 5 = 45

subtract 5 from both sides

4y = 40

divide for from both sides

y = 10

plug in 10 to get 40 yellow marbles then subtract by 5 to get 35 marbles

thus there are only 10 yellow marbles