Which of the following correctly describes the During S phase, DNA synthesis originates at chromosome number in this rat kangaroo cell? specific sequences in the chromosomal DNA. The haploid chromosome number is 12. How many sites for initiation of DNA synthesis The haploid chromosome number is 24. would be expected among the chromosomes The diploid chromosome number is 12. within the rat kangaroo karyotype during S The diploid chromosome number is 24. phase? The triploid chromosome number is 24. Fewer than 12 12 During anaphase, how many kinetochores Between 12 and 24 would be expected in a normal rat kangaroo 24 lymphocyte? More than 24 12 18 24 36 48 Questions 160-164 The diagram below is a pedigree of three generations showing the occurrence of two genetically-transmitted diseases. Phenotypes of affected individuals are shown. Circles represent females, and squares represent males. Assume that the diseases are rare, unlinked, and that individuals not blood related to I-a sad I-b (“in-laws") do not have either disease-producing allele. Which one of the following is true concerning homozygous recessive. Individual I-a? heterozygous. He is homozygous for Disease 1. and the homozygous dominant. allele for this disease is autosomal spontaneous mutant recessive. Not enough information to determine He is heterozygous for Disease 1. and the allele for this disease is X-linked recessive. 3. lf Individual III - r marries a normal man with He is heterozygous for Disease 1. and the a homozygous wild-type genotype. what is the allele for this disease is dominant. probability that son would have Disease He is heterozygous for Disease 1. and the 2? allele for this disease is recessive. 0 Cannot be determined from the 1/4 information 1/2 3/4 2. The genotype of Individual l-h for Disease 2 7/8 is:
Which of the following correctly describes the chromosome number in this rat kangaroo cell? The haploid chromosome number is 12. The haploid chromosome number is 24. The diploid chromosome number is 12. The diploid chromosome number is 24. The triploid chromosome number is 24. During anaphase, how many kinetochores would be expected in a normal rat kangaroo lymphocyte? 12 18 24 36 48 During S phase, DNA synthesis originates at specific sequences in the chromosomal DNA. How many sites for initiation of DNA synthesis would be expected among the chromosomes within the rat kangaroo karyotype during S phase? Fewer than 12 12 Between 12 and 24 24 More than 24 Questions 160-164 The diagram below is a pedigree of three generations showing the occurrence of two genetically-transmitted diseases. Phenotypes of affected individuals are shown. Circles represent females, and squares represent males. Assume that the diseases are rare, unlinked, and that individuals not blood related to I-a sad I-b (“in-laws") do not have either disease-producing allele. Which one of the following is true concerning Individual I-a? He is homozygous for Disease 1. and the allele for this disease is autosomal recessive. He is heterozygous for Disease 1. and the allele for this disease is X-linked recessive. He is heterozygous for Disease 1. and the allele for this disease is dominant. He is heterozygous for Disease 1. and the allele for this disease is recessive. Cannot be determined from the information 2. The genotype of Individual l-h for Disease 2 is: homozygous recessive. heterozygous. homozygous dominant. spontaneous mutant Not enough information to determine 3. lf Individual III - r marries a normal man with a homozygous wild-type genotype. what is the probability that son would have Disease 2? 0 1/4 1/2 3/4 7/8
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