In an organism, two separate genes influence the length of the hair. The allele

Question

In an organism, two separate genes influence the length of the hair. The allele for long hair, L, dominates the allele for short hair, I. The allele for hair, H, dominates the hairless allele, h. In the cross between parents of genotype LIHh and llHh, what ratio of phenotypes would you expect to see? Select one a. 8 long haired 8 short haired b.4 long haired:3 short haired: 1 no hair O c. 9 long haired 3 short haired 4 no hair d.3 long haired 3 short haired 2 no hair A person with 47 chromosomes could have which of the following conditions? Select one or more a. Turners syndrome b. Klinetelters syndrome c. Cri du chat d. Down syndrome

Explanation / Answer

1. c. 9 long haired; 3 short haired and 4 no hair.

2. b. Klinefelter syndrome results from the presence of one extra copy of the X chromosome in each cell (47,XXY).

d. Down syndrome, also known as trisomy 21 because it's caused by an extra chromosome 21.

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