21) How many Barr bodies would you expect to see in human cells containing the X

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21) How many Barr bodies would you expect to see in human cells containing the XXX chromosomes? B) 0 C) 2 D) 3 E) 4 22) What is the sexual phenotype of a Drosophila fly with the XXY chromosome? Assume diploid for Drosophila 23) In this organism's sex determination system diploid females produce haploid males 24) In this organism, females have heterogametic sex chromosomes (ZW) whereas males have A) male B) female C) intersex D) meta male E) meta female A) humans B) birds C) bees D) alligators E) Drosophila fly the homogametic sex chromosomes (ZZ). A) humans B) birds C) bees D) alligators E) Drosophila fly This inheritance pattern occurs when dominant alleles of two genes are involved equally in expressing one phenotype usually producing a 15:1 phenotypic ratio in the F2 generation. C) dominant epistasis A) recessive epistasis D) complementary gene action B) gene redundancy E) recessive suppressor 26) This inheritance pattern occurs when one dominant allele at one locus masks phenotypic effects of a different gene usually producing 12:3:1 phenotypic ratio in the F2 generation. C) dominant epistasis A) recessive epistasis D) complimentary gene action B) duplicate gene action E) recessive suppressor 27) Two different true-breeding strains of corn that produce ears with white kernels were crossed to each other. The F1 plants were all red, while both red and white kernels were observed in F2 generation in a 9:7 ratio A) recessive epistasis D) complimentary gene action C) dominant epistasis B) duplicate gene action E) recessive suppressor 28) Referring to question #27, how many genes determine flower color A) 1 B) 2 D) 4 29 Referring to question #27, what is the genotype of one of the white kernel true breeding strain? A) AA B) aa C) AABB D) aabb E) AAbb 30) This inheritance pattern occurs when recessive alleles in one locus masks phenotype of an allele in another locus usually producing 9:3:4 phenotypic ratio in the F2 generation A) recessive epistasis D) complimentary gene action B) duplicate gene action E) recessive suppressor C) dominant epistasis Question 31 to 34 are connected Shell coiling of the snail Limnaea peregra results from a genetic maternal effect. An autosomal allele for a right-handed shell (D), called dextral, is dominant over the allele for a left-

Explanation / Answer

21. Only one X-chromosome remains active and the remaining will become Barr bodies. So, XXX woman would show 2 Barr bodies.

22. In Drosophila, XXY = Male

23. Bees produce haploid males.

24. ZW-ZZ sex determination is seen in Birds

25. Complementary gene action = 15:1

26. Dominant epistasis = 12:3:1

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