In the garden pea, yellow cotyledon color (Y) is dominant to green (y), and inflated pod shape (P) dominant to constricted (p). A yellow cotyledon/inflated pea plant (YYPP) was crossed with a green cotyledon/constricted (yypp) pea plant. The resulting F1 hybrid plant displayed a yellow cotyledon and inflated phenotype. Selfing the F1 plants was performed and the F2 numbers are shown below.
193 green, inflated
184 yellow, constricted
556 yellow, inflated
61 green, constricted
A) What was the genotype of the F1 plants?
B) Diagram a Punnet-square to predict the phenotypic ratios in the F2 generation. Write out those F2 ratios clearly.
C) Perform a CHI-SQUARED analysis to determine if these genes/alleles are independently assorting. A chart of p-values is provided. Offer an interpretation of your results.
D) Offer a definition of independent assortment (Menel's Second Law).
Homework Answers
Answer-
A) genotype of F1 plants = YyPp
B) Punnet-square is given below:
The expected phenotypic ratio is:
yellow, inflated : yellow, constricted : green, inflated : green, constricted = 9 : 3 : 3 : 1
C) The p-value is greater than 0.95; so, the two genes are assorting independently.
D) law of Independent Assortment: If the inheritance of more than one pair of charaters is studied simultaneously, the factors or genes for each pair of characters assort out into the gametes independently of the other pairs.
The explanation is given below:
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