6. In the marbled murrelet, plumage color may be black, gray or white. Color is

Question

6. In the marbled murrelet, plumage color may be black, gray or white. Color is due to three alleles: c; c;c. Regardless of what crosses you make between coat color phenotypes, you never obtain female progeny with black feathers. What must be true? a) Black is recessive in females and dominant in males. b) Black is a lethal recessive on an autosome. c) Black is a lethal recessive on the X-chromosome. d) Expression of black is limited to males. e) The described results are impossible. 7. In a cross between two individuals heterozygous for three autosomal, independently assorting loci (Gi.e., A/a; B/b; E/e), what is the probability of getting an offspring whose phenotype differs troumbot 4b) GA(4 1( (1/4 )1-(3/a+(1/4A)) 8. If two mice ofgenotype F/f; G/g; H/h; 1 J/j are repeatedly mated, how many different phenotype will be found in the progeny if the genes are assorting independently? a) two b) five c) fifteen d) sixteen e) thirty-two

Explanation / Answer

6. D.Expression of black is limited to males. Sex limited genes are present in both sexes but expressed in only one sex and remain turned off in the other.

Other option A- Black is recessive in female and dominant in males it not occurs. Dominant and recessive occurs in both sex.

B, C. Lethal recessive an autosome and X chromosome . Autosome means it equally distributed to males and females.

7. C 37/64

8. E-32          Different phenotypes = 2n ; n=number of genes

For 1 gene Tall or dwarf 2 phenotype   = 21

For 2 gene Dihybrid cross 4 phenotype. 9:3:3:1 = 22

For 5 gene - 32 phenotype. 25

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