10. Colored aleurone in the kernels of corn is due to the dominant allele R. The

Question

10. Colored aleurone in the kernels of corn is due to the dominant allele R. The recessive allele r, when homozygous, produces col orless aleurone. The plant color (not the kernel color) is con- trolled by another gene with two alleles, Yand y. The dominant Y allele results in green color, whereas the homozygous pres- ence of the recessive y allele causes the plant to appear yellow. In a testcross between a plant of unknown genotype and phe- notype and a plant that is homozygous recessive for both traits, the following progeny were obtained: Colored, green Colored, yellow Colorless, green Colorless, yellow 12 92 Explain how these results were obtained by determining the ex- act genotype and phenotype of the unknown plant, including the precise arrangement of the alleles on the homologs

Explanation / Answer

Answer:

The heterozygous parent in the test cross is RY/ry x ry/ry with the two dominant alleles on one chromosomes and the two recessives on the homolog.

Recombinant progeny were the 12 coloured yellow and the 8 colourless green.

The percentage of recombinants were 20/200 = 10%, which indicates a distance of 10cM between the two genes.

Related Questions

Navigate

• Browse (All)
• Browse 1
• Subjects

---

---

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