Question

1. In genetics, when two heterozygous parents (each with genetic code Aa) are crossed, there are four possibilities for the child: AA, Aa, aA, and aa. In many cases, A is a dominant allele, so the four genotypes mentioned collapse to 2 phenotypes (AA, Aa, and aA show the dominant trait, while aa reveals the recessive trait, giving a 3:1 phenotypic ratio). In the case of incomplete dominance, the Aa and aA cases do not give the same phenotype as AA, and so three pheno- types are present in the ratio 1:2:1, specifically (AA):(Aa or aA):(aa). One typical example is the snapdragon flower whose color trait is incomplete with AA being red, Aa or aA being pink, and aa being white. Suppose we take 250 sets of heterozygous snapdragon parets and breed them to make 250 flower children. a. Map this situation to the notation established on slide 4 of lecture 6. b. Find the probability of getting 61 red and 59 white flower children. Use scientific notation for your answer. c. Let (R, P, W) (red, pink, white) be the random vector that comes from crossing only 2 sets of parents (instead of 250). Draw the probability mass function for W~pw(w). Then, think of a clever way to draw the pmf for the vector (R, P, W) PRPw)(r,p,).

just question C

Answer 1

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