EXPLAIN for Rating I need Explanation In a particular plant three genes (Aa, Bb,

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EXPLAIN for Rating

I need Explanation

In a particular plant three genes (Aa, Bb, Cc) influence height. such that each dominant allele adds 2 cm. to a base height of 2 cm. The recessive alleles do not add any height. The three genes are linked, as shown on the map below. For this region of the chromosome, there is no interference. You crossed a 14 cm tall homozygous dominant plant [ABC/ABC] with a 2 cm tall homozygous recessive plant [abc/abc] to generate F1 trihybrid plants. The trihybrid plants were then backcrossed to the 2 cm parent (this is a testcross, right?). Part B What percentage of the testcross progeny will be 2 cm tall? Enter the number, including 2 decimal places. Include the % symbol where indicated. Part C What percentage of the testcross progeny will be 4 cm tall? Enter the number, including 2 decimal places. Include the % symbol where indicated.

Explanation / Answer

Testcross is AaBbCc X aabbcc (cross between F1 offspring and homozygous recessive parent)

Gametes are ABC, ABc, Abc, aBC, AbC, abc,abC, aBc; and abc (All genotypes produced will be 1/8)

2cm tall progeny is obtained when cross occurs in gametes abc ; will be 1/8 = 12.5%

4cm tall progeny is obtained when any two alleles are homozygous. In this case, AaBbcc, aaBbCc,AabbCc genotypes are 4cm tall; thus accounting to 3/8 = 37.5%

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