Chapter 15 Review Page 1

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1 hapter 15 Review Page 1 1 ased on the results of this cross, you determine that the allele for round eyes is linked to the allele for no tooth. round eyes are dominant to vertical eyes, and the absence of a tooth is dominant to the presence of a tooth. round eyes are dominant to vertical eyes, and the presence of a tooth is dominant to the absence of a tooth. vertical eyes are dominant to round eyes, and the absence of a tooth is dominant to the presence of a tooth. 2 The results of the following cross indicate that the two genes are linked. Mendlien species is polyploid. two genes assort independently. absence of a tooth is dominant to vertical eyes. 3 n F1 individual can produce different gametes when both eye and tooth genes are considered /7/2012 9:54:50 M

2 hapter 15 Review Page 2 4 Given these chromosomes, which of the choices represents the possible recombinant gametes? 5 The results of a F1 testcross are: 250 bald head, four ears : 247 hairy head, six ears : 21 bald head, six ears : 19 hairy head, four ears. How many map units apart are the head and ear genes? /7/2012 9:54:50 M

3 hapter 15 Review Page 3 6 Which of the individuals is homozygous recessive for both of the gene pairs? the male parent the F1 generation the female parent both the male and female parents 7 The results of the following cross indicates that the two genes are linked. Mendlien species is polyploid. two genes assort independently. absence of a tooth is dominant to vertical eyes. 8 The recombination frequency between gene and gene is 8.4%, the recombination frequency between gene and gene is 6.8%, and the recombination frequency between gene and gene is 15.2%. Which of these is the correct arrangement of these genes? 9 color-blind woman mates with a male with normal color vision. Which of these results would indicate that color blindness is caused by an X-linked recessive allele? Half of the sons and half of the daughters are color-blind. ll of the daughters, and none of the sons, are color-blind. ll of the sons, and none of the daughters, are color-blind. The offspring occur in a ratio of 3 color-blind : 1 normal vision. 12/7/2012 9:54:50 M

4 hapter 15 Review Page 4 10 olor blindness is an X-linked recessive trait. color-blind man has a daughter with normal color vision. What is the genotype of the daughter? XcY XY XXc XX 11 Hypophosphatemia (vitamin -resistant rickets) is inherited as an X-linked dominant. n unaffected woman mates with a male with hypophosphatemia. What is the expected phenotypic ratio of their offspring? 3 normal female : 1 male with hypophosphatemia 1 daughter with hypophosphatemia : 1 normal son 1 normal daughter : 1 son with hypophosphatemia 2 normal females : 1 normal male : 1 male with hypophosphatemia 12 Hypophosphatemia (vitamin -resistant rickets) is inherited as an X-linked dominant. woman without hypophosphatemia and a man with hypophosphatemia have a daughter. The daughter mates with a male without hypophosphatemia. What is the expected phenotypic ratio of their offspring? 1 unaffected daughter : 1 son with hypophosphatemia 3 unaffected females : 1 male with hypophosphatemia 2 unaffected females : 1 unaffected male : 1 male with hypophosphatemia 1 unaffected female : 1 female with hypophosphatemia : 1 unaffected male : 1 male with hypophosphatemia 13 Suppose that having three nostrils is a dominant Y-linked character. woman with two nostrils mates with a man with three nostrils. What is the expected phenotypic ratio of their offspring? 1 daughter with two nostrils : 1 son with three nostrils 2 daughters with two nostrils: 1 son with two nostrils: 1 son with three nostrils 2 daughters with three nostrils: 1 son with two nostrils: 1 son with three nostrils 1 daughter with two nostrils: 1 daughter with three nostrils: 1 son with two nostrils : 1 son with three nostrils 14 Humans are diploid and have 46 chromosomes (or two sets). How many sets of chromosomes are found in each human gamete? /7/2012 9:54:50 M

5 hapter 15 Review Page 5 15 Humans are diploid and have 46 chromosomes. How many chromosomes are found in each human gamete? is the process by which haploid gametes form a diploid zygote. Mitosis Meiosis Fertilization Gastrulation 17 particular diploid plant species has 48 chromosomes, or two sets. mutation occurs and gametes with 48 chromosomes are produced. If self-fertilization occurs, the gametes will have set(s) of chromosomes Which of these terms applies to an organism with extra sets of chromosomes? diploid haploid trisomy polyploid 19 Mutant tetraploid plants are usually sickly. are unable to self-fertilize. are able to interbreed with their parents. are unable to interbreed with a diploid plant. 20 Polyploid plants could possibly arise as a result of hybridization. a mutation of gamete formation followed by fertilization. a mutation of gamete formation followed by self-fertilization. all of the above 12/7/2012 9:54:50 M