\"A\", \"B\", and \"C\" are three unlinked QTL\'s, each with two alleles, that a

Question

"A", "B", and "C" are three unlinked QTL's, each with two alleles, that affect the vitamin E content of corn: AA BB CC plants have the highest levels, and aa bb cc have the lowest. A cross between vitamin-rich and vitamin-poor strains produced trihybrid (Aa Bb Cc) F_1 plants, which all had very similar, intermediate vitamin E levels. When the F_1's were selfed, the vitamin E content in the F_2 progeny showed a much broader continuous distribution. 1) Among the F_2 progeny, ______ [give a fraction] should have the same genotype (AA BB CC) as the vitamin-rich parental strain, and ______ should have 4 "high yield" (capital letter) alleles and 2 low yield alleles. 2) Consider the various F_2 categories/genotypes that have 3 low and 3 high yield alleles. Assume each gene/high yield allele contributes equally to the vitamin E content, these should all have ~ the same intermediate level as that seen in the F_1 trihybrid. How many (i.e., what fraction) of the F_2 plants in this in this "intermediate" (3+3) group have the same genotype (Aa Bb Cc) as their trihybrid parent?

Explanation / Answer

1) Among the F2 progeny 1/64 should have AABBCC genotype. And 15/64 should have 4 high yield ( capital letter) and 2 low yield ( small letter) .

2) 20/64 will be intermediate in F2 with 3+3 ( 3 capital and 3 small letter)

2)

Related Questions

Navigate

• Browse (All)
• Browse #
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.