Question

24. The cross $E/E \cdot F/F \times ele \cdot f/f$ is made, and the F? is then backcrossed with the recessive parent. The progeny genotypes are inferred from the phenotypes. The progeny genotypes, written as the gametic contributions of the heterozygous parent, are in the following proportions: $E \cdot F$ $rac{2}{6}$ $E \cdot f$ $rac{1}{6}$ $e \cdot F$ $rac{1}{6}$ $e \cdot f$ $rac{2}{6}$ Explain these results.

          24. The cross $E/E \cdot F/F \times ele \cdot f/f$ is made, and the F? is then backcrossed with the recessive parent. The progeny genotypes are inferred from the phenotypes. The progeny genotypes, written as the gametic contributions of the heterozygous parent, are in the following proportions:

$E \cdot F$ $rac{2}{6}$
$E \cdot f$ $rac{1}{6}$
$e \cdot F$ $rac{1}{6}$
$e \cdot f$ $rac{2}{6}$

Explain these results.

24. The cross E/E · F/F × ele · f/f is made, and the F? is then backcrossed with the recessive parent. The progeny genotypes are inferred from the phenotypes. The progeny genotypes, written as the gametic contributions of the heterozygous parent, are in the following proportions:

E · F rac26
E · f rac16
e · F rac16
e · f rac26

Explain these results.

Added by Michael L.

Biology for AP Courses

Julianne Zedalis, John Eggebrecht

Instant Answer

Solved by Expert Shiksha Dutta

08/04/2020

Step 1

Because each homozygous parent contributed the alleles E-F and e-f respectively, the F1 chromosomes are in coupling (cis) phase: one homolog carries E-F and the other carries e-f. Show more…

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The cross (E)/(E)*(F)/(F) imes ele*(f)/(f) is made, and the F_(1) is then backcrossed with the recessive parent. The progeny genotypes are inferred from the phenotypes. The progeny genotypes, written as the gametic contributions of the heterozygous parent, are in the following proportions: E*F,(2)/(6) E*f,(1)/(6) e*F,(1)/(6) e*f,(2)/(6) Explain these results. 24. The cross E/EF/Felef/f is made, and the F is then backcrossed with the recessive parent. The progeny genotypes are inferred from the phenotypes. The progeny genotypes, written as the gametic contributions of the heterozygous parent, are in the following proportions: E.F E.f e.F 6 Explain these results