How do I find the genotype of parents? The off spring produce 65 white squash and 19 yellow.

Question

How do I find the genotype of parents?  The off spring produce 65 white squash and 19 yellow.

aaronq · Answer

Do you know anything else? like is white dominant?

anonymous · Answer

No, that is what I have to find out. I just need to find out the ratio of what it could be. For example the phenotype could be hypothetically 25% Yellow:75% white

aaronq · Answer

The off spring produce 65 white squash and 19 yellow. so is this the 2nd generation? or are the offspring themselves 65 white and 19 yellow?

anonymous · Answer

Yes, the offspring themselves are 65 white and 19 yellow, white being the dominant trait. This is a second generation.

aaronq · Answer

um so you'd assume yellow would be recessive let's call it yy
and Yy and YY account for the rest, R is dominant

65/3 = 21.6 YY
2(65/3)= 43.3 Yy
19 rr

almost 1:2:1 ratio

then i would say the parents both had Yy. 

the number are off, but id suggest you try this by doing several punnett squares

aaronq · Answer

"and Yy and YY account for the rest, R is dominant.." i meant Y is dominant.