How do I derive the correct answer for these three problems? This information is

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How do I derive the correct answer for these three problems?

This information is used for the following four gquestions In garden peas, tall (T) is dominant to short (t), purple flowers (P) are dominant to white flowers (p), axial flowers (A) are dominant to terminal flowers (a), and yellow seeds (Y) are dominant to green seeds (y) You make this cross: Tt Pp Aa Yy (female) x TT Pp aa yy (male) 30) How many different possible genotypes are possible in the F1 offspring? a) 8 b) 12 c) 16 d) 24 e) 48 31) How many different possible phenotypes are possible in the F1 offspring? b) 12 c) 16 d) 24 e) 48 32) What fraction of the F1 offspring are expected to be tall with white terminal flowers and green seeds? a) 1/8 b) 3/16 c) 1/16 d) 1/32 e) 1/64

Explanation / Answer

30.
Cross = Offspring = Genotype ration = no. of genotypes
TT x Tt = TT:Tt = 1:1 = 2
Pp X Pp = PP : Pp : pp = 1:2:1 = 3
Aa X aa = Aa : aa = 1:1 = 2
Yy X yy = Yy : yy = 1:1 = 2

The total possible genotypes = 2 x 3 x 2 x 2 = 24.

31.
Cross = Offspring = phenotype ration = no. of phenotypes
TT x Tt = T_ = 1 = 1
Pp X Pp = P_ : pp = 3:1 = 2
Aa X aa = Aa : aa = 1:1 = 2
Yy X yy = Yy : yy = 1:1 = 2

The total possible phenotypes = 1 x 2 x 2 x 2 = 8.

32.
The proportion of of tall, white terminal flowers and green seeds =
1/1 X 1/4 x 1/2 X 1/2 = 1/16

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