Now Solve This 3-1 pg 45. Complete the following table by determining the possib

Question

Now Solve This 3-1 pg 45. Complete the following table by determining the possible GENOTYPE(s) of individuals (some cells will be blank, others may have more than one genotype possible) Pigeons may exhibit a checkered or plain color pattern. In a series of controlled matings, the following data were obtained. Fi Progemy P1 Cross (a) checkered x checkered (b) checkered x plain (c) plain x plain 36 38 35 Then F1 offspring were selectively mated with the following results. (The P1 cross giving rise to each F1 pigeon is indicated in parentheses.) F2 Progeny Checkered Plain F1 X F1 Crosses (d) checkered (a) x plain (c) (e) checkered (b) x plain (e) 17 (f) checkered (b) x checkered (b) (g) checkered (a) x checkered (b) 39 How are the checkered and plain patterns inherited? Select and assign symbols for the genes involved, and determine the genotypes of the parents and offspring in each cross. HINT: This problem involves an understanding of how traits are inherited and transmitted to offspring. The key to its solution is first to determine whether there is more than one gene pair involved by converting the data to ratios that are characteristic of Mendelian crosses. In the case of this problem, you should consider whether any of the F2 ratios match Mendel's 3:1 monohybrid ratio. P1 Cross Progeny Cross Parent 1 Parent 2 Checkered Plain

Explanation / Answer

Lets have there are two genes responsible for plain and checkered , and those are A and a.

Plain - aa(homozygous recessive)

Checkered - AA(homozygous dominant) - which are checkered type a

checkered - Aa(heterozygous) - which are checkered type b

The trait is inherited as an autosomal recessive trait.

CROSS - P1 CROSS PROGENY

Parent 1 Parent 2 Checkered Plain

A - aa aa - aa

B - AA(a) aa Aa(b) -

C - AA(a) Aa(b) AA(a) & Aa(b) -

D - AA(a) aa Aa(b) -

E - Aa(b) aa Aa(b) aa

F - Aa(b) Aa(b) AA(a) & Aa(b) aa

G - AA(a) Aa(b) AA(a) & Aa(b) -

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