43. Codominant alleles are expressed in individuals that are a) penetrant b) hom

Question

43. Codominant alleles are expressed in individuals that are a) penetrant b) homozygous c) polymorphic d) heterozygous e) expressive 44. is the condition in which one allele only partially inhibits the expression of the other allele in the phenotype. Heterozygotes exhibit phenotypes representing a combination (or blending) of the two homozygotes. a) Dominance b) Co-dominance c) Incomplete dominance d) Conditional dominance e) None of these 45. Red-green color blindness is X-linked recessive. A woman with normal color vision has a father who is color blind. The woman has a child with a man with normal color vision. Which phenotype is NOT expected in her child? a) a color-blind female b) a color-blind male c) a noncolor-blind female d) a noncolor-blind male e) all of these are expected 46. When do the homologous chromosomes separate? a) during mitosis b) during meiosis I, anaphase c) during meiosis II, anaphase d) They do not segregate 47. A Barr body is a(n)... a) gene on the X chromosome that is responsible for female development. b) patch of cells that has a phenotype different from surrounding cells because ot activated X chromosome, visible in the nucleus of a cell that is from a female mammal. variable X inactivation. d) extra X chromosome in a cell that is the result of nondisjunction. e) extra Y chromosome in a cell that is the result of nondisjunction.

Explanation / Answer

43. D) heterozygote

44. C) incomplete dominance

45.) color blind female

46.) anaphase of meiosis I

47.) c.) inactivated X chromosome, visible in the nucleus of a cell that is from a female mammal

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