Littorina Shells

Genetics Question. Hypothesis of phenotypes!? Plz Help!?

The shells of a species of marine snail, Littorina sitkana, can be either tall or short. Tall (T) is dominant to short (t). In addition, the shell colour brown (B) is dominant to the shell colour yellow (b).
A tall brown male is mated to a short yellow female and the resulting F1 offspring are. allowed to interbreed. The resulting 320 F2 offspring had the following phenotypes:
188 – Tall brown
51 – Tall yellow
66 – Short brown
15 – Short yellow

We did this last year in science. Basically it is all about DNA. The Phenotype is representing how DNA is passed on. The dominate is more likely to be passed on then the recessive. The recessive is the one that isn’t dominant. In this case Tall is the dominate gene and Short is the recessant gene. The same with the brown being dominate and yellow being recessive.

So now if you think about it it makes sense that there are the most tall browns because those are the two dominant genes.

Then the tall yellows and short browns are pretty much the same because those both have one dominant and one recessive.

Then there are the least short yellows because those are both recessive.

Hope this helps

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