Question

A variety of snail has an inherited condition that affects the thickness of the shell. The alleles are t and n.

tt have thick shells
tn have thin shells
nn do not survive

Two heterozygous snails are mated. What is the probability that a surviving snail of the next generation is a heterozygote?

My workings:

So a tn snail mates with another tn snail, and they would get a tt, tn, tn, and nn right?

That means 3 out of 4 survives.

and the heterozygotes are the tn snails, so is the answer 2/3???

Answer 1

If you are also Mike, please only post your questions once. Repeating posts will not get a quicker response. In addition, it wastes our time looking over reposts that have already been answered in another post. Thank you.

If not, you are right!