. The production of pigment in the outer layer of seedsof corn requires each of the three independently assorting genes A, C, and R to be represented by at leastone dominant allele, as specified in Problem 64. Thedominant allele Pr of a fourth independently assortinggene is required to convert the biochemical precursorinto a purple pigment, and its recessive allele pr makesthe pigment red. Plants that do not produce pigmenthave yellow seeds. Consider a cross of a strain of genotype A/A ; C/C ; R/R ; pr/pr with a strain of genotypea/a ; c/c ; r/r ; Pr/Pr.a. What are the phenotypes of the parents?b. What will be the phenotype of the F1?c. What phenotypes, and in what proportions, willappear in the progeny of a selfed F1?d. What progeny proportions do you predict from thetestcross of an F1?
. The production of pigment in the outer layer of seeds
of corn requires each of the three independently assorting genes A, C, and R to be represented by at least
one dominant allele, as specified in Problem 64. The
dominant allele Pr of a fourth independently assorting
gene is required to convert the biochemical precursor
into a purple pigment, and its recessive allele pr makes
the pigment red. Plants that do not produce pigment
have yellow seeds. Consider a cross of a strain of genotype A/A ; C/C ; R/R ; pr/pr with a strain of genotype
a/a ; c/c ; r/r ; Pr/Pr.
a. What are the
b. What will be the phenotype of the F1?
c. What phenotypes, and in what proportions, will
appear in the progeny of a selfed F1?
d. What progeny proportions do you predict from the
testcross of an F1?
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