ID: A Name: 28. Twins are said to be concordant for a trait when: A. Only frater

Question

ID: A Name: 28. Twins are said to be concordant for a trait when: A. Only fraternal twins exhibit the trait. B. Fraternal twins more often show the trait than identical twins C. Only identical twins exhibit the trait. D. Both twins of a set of twins exhibit the trait. 29. The form of gene interaction in which one gene prevents or masks the expression of another gene is called A. incomplete dominance B. epistasis C. codominance D. multiple alleles All of the following can be identified by karyotype analysis EXCEPT A. Number of chromosomes s0. Sex of the individual tested Presence of an abnormal gene A translocation B. C. D. 31. Most triploid zygotes arise from: A. fusion of the zygote with an unfertilized egg B. C. D. fertilization of a normal haploid egg by a diploid sperm fertilization of a normal haploid egg by two sperm nondisjunction during the zygote's first mitotic division 32. Ribosomes are organelles whose function is to A. produce spindle fibers B. produce cellular energy C. synthesize of proteins transport materials throughout the cytoplasm D. Variation in human skin color is controlled by many genes and is the result of A. incomplete dominance B. codominance C. polygenic inheritance. D. mitochondrial inheritance 33. 34. If a trait is inherited in an autosomal recessive fashion, which of the following is not true? A. The trait often appears in the progeny of unaffected parents. B. Consanguinity may be present. C. About one-fourth of the offspring of two heterozygotes will be affected. D. Two affected individuals can have an unaffected child.

Explanation / Answer

Ans.28 this question is not visible properly.

Ans.29 B (epistasis)

Ans.30 B

Ans. 31 C

Ans .32 C

Ans. 33 C polygenic inheritance

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