Tall pea plants are dominant over short pea plants. If there are 200 short plants in the F2 generation from a cross that followed Mendel’s methods, about how many plants will be tall in that generation?
200
300
600
1,000

Question

Tall pea plants are dominant over short pea plants. If there are 200 short plants in the  F2 generation from a cross that followed Mendel’s methods, about how many plants will be tall in that generation?
200
300
600
1,000

shrutipande9 · Answer

hey alydawn...umm do u know the phenotypic ratio obtained after crossing the f1 generation by mendel's method?

anonymous · Answer

Nope. That's all the info that I was given in that question there.

shrutipande9 · Answer

okay....so lets start from the beginning...take the parents TT and tt and cross them to get the f1 generation...can u do that for me?

anonymous · Answer

Okay, so everything in the f1 generation has the genotype Tt.

shrutipande9 · Answer

great....now cross Tt with Tt

anonymous · Answer

So then there's TT, Tt, Tt, and tt.

shrutipande9 · Answer

great..:D
now out of these how many would result into tall plants?

anonymous · Answer

3

shrutipande9 · Answer

so 1 would be short...so the ratio is 3:1 right? so if u have 200 short...then 3 times 200 would be tall..:D

anonymous · Answer

Ohhh okay, so 600. Thank you! (:

shrutipande9 · Answer

u did it all...:D
u r good at genetics..well done..:D