How many unique gametes could be produced through independent assortment by an i

Question

How many unique gametes could be produced through independent assortment by an individual with the genotype AaBbCC? a. 4 b. 6 c. 8 d. 10 e. 12 A sexually reproducing animal has two unlinked genes, one for head shape (H) and one for tail length(T). Its genotype is HtTt. Which of the following genotypes is possible in a gamete from this organism? a. Hh b. HhTt c. Tt d. HT e. none of the above Red-green color blindness is a sex-linked recessive trait in humans. Two people with normal color vision have a color blind son. What are the genotypes of the parents? a. X^n X^n and X^n Y b. X^N X^N and X^n Y c. X^N X^N and X^N Y d. X^N X^n and X^n Y e. X^N X^n and X^N Y Cinnabar eyes is a sex-linked, recessive characteristic in fruit flies. If a female having cinnabar eyes is crossed with a wild-type male, what percentage of the F_1 males will have cinnabar eyes? a. 0% b. 25% c. 50% d. 75% e. 100% During replication, what enzyme adds complimentary bases? a. helicase b. synthesize c. replicase d. polymerase e. transcriptase. DNA polymerase can add new nucleotides to the free___of a nucleotide strand. a. 1'end b. 2'end c. 3'end d. 4'end e. 5'end

Explanation / Answer

30. a) 4. An allele for the 'A' gene can be selected in 2 ways (B and b), for the 'B' gene in 2 ways, and for the 'C' gene in 1 way. Total number of ways are = 2 x 2 x 1 = 4 ways.

31. d) HT. Genotype is HhTt, alleles are H, h, T, t. Gametes will be HT, Ht, hT, ht.

32. e) XNXn and XNY. As this is a recessive trait, both will be normal, and the maternal Xn chromosome will combine with paternal Y chromosome to give a color-blind son.

33. e) 100%. With a sex linked and recessive trait, if the female has cinnabar eyes, then its genotype is XcXc. Its cross with wild type male (XcXc x XY) will give the gametes as (Xc and X, Y), which will combine to give offsprings XcX (female) and XcY (male). As we can see, all the males will have cinnabar eyes.

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