1) The probability that two genes will be separated by crossing-over is related to: a) he phenotype that they control b) how far the two genes are from the centromere c) the distance between the two genes on the chromosome d) whether the two genes are located on a sex chromosome 2) In genetics, map units express the distance between: a) chromosomes during metaphase b) two loci on a chromosome c) alleles d) homologous chromosomes 3) In a two-point test cross, 36 of the offspring were recombinant types. The remaining 64 offspring were parental types. How many map units separate the two loci? a) 28 m.u. b) 36 m.u. c) 64 m.u. d) 100 m.u. 4) The sex of most mammals, birds, and insects is determined by: a) the temperature b) the environment c) sex chromosomes d) chance 5) The sex of a human is determined by: a) the number of autosomes b) the presence of only one X chromosome c) the number of sex chromosomes d) the presence of Y chromosome 6) The offspring of two heterozygous gray-bodied, normal-winged flies should be gray-bodied/normal wings (BbRr) and black-bodied/vestigial wings (bbrr) because these alleles are linked. If a small number, say 15%, of the offspring are instead black-bodied with normal wings, this is most likely the result of: a) crossing over. b) incomplete dominance. c) codominance. d) mutation. 7) What are the possible phenotypes of the children if the mother has Type A blood and the father has type AB blood? a) A, B. b) A, AB. c) A, B, AB. d) A, B, O. 8) What are the possible phenotypes of the children if the mother’s genotype is IAi for blood type and the father is IBi? a) All AB. b) A, AB. c) A, B, O. d) A, B, AB, O. 9) What are the predicted phenotypes of the male children from the union of a woman who is heterozygous for hemophilia and a man who has normal blood clotting characteristics? a) All normal b) 3 normal: 1 hemophilia c) 1 hemophilia : 1 normal d) 1 hemophilia : 3 normal 10) What are the possible genotypes of a female child from the union of a woman who is heterozygous for hemophilia and a man who has normal blood clotting characteristics? a) XHXH or XHXh b) XHXh c) XHXH d) Hh 11) In humans, assume that brown eye is dominant and blue eye is recessive. If two brown-eyed individuals have a child with blue eyes, that means: a) both parents are homozygous for brown eyes. b) both parents are heterozygous for eye colour. c) there is a 1/4 chance that their second child will have brown eyes. d) there is a 50/50 chance that their second child will have blue eyes. 12) Why colour-blindness more common in males than in females? a) because females would have to receive two copies of the recessive colour blindness gene to actually express the trait. b) Because a male only needs to receive the recessive gene from his mother to be colour-blind. c) Because colour-blindness is an X-linked trait. d) All of the above. 13) How many phenotype(s) will be produced by crossing Bb x BB if the pair of alleles are codominant? a) 1 b) 2 c) 3 d) 4 14) In Antirrhinum sp. plants, red and white flowers, are controlled by a pair of incomplete dominant alleles. Heterozygous plants show an intermediate phenotype, pink. If two pink flowered plants are crossed, what is the expected phenotypic ratio of the progenies? a) All pink b) One red : one white c) Two pink : one white d) One red : two pink : 1 white 15) How many type(s) of gamete(s) is/are produced by an organism that has a genotype of AaBb? a) 1 b) 2 c) 3 d) 4

Deviation From Mendelian Inheritance

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