Exam 4 Review & Notes

In a small popula8on gene8c drik results in some

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Unformatted text preview: a family. This is likely due to: a) Trisomy for chromosome 21 caused by nondisjunc8on during egg forma8on. b) Trisomy for chromosome 21 caused by nondisjunc8on during sperm forma8on. c) Monosomy for chromosome 21 caused by a nondisjunc8on during egg forma8on d) A transloca8on involving chromosome 21. e) a and b are equally likely. 15. Downs Syndrome occurs at a high frequency in a family. This is likely due to: a) Trisomy for chromosome 21 caused by nondisjunc8on during egg forma8on. b) Trisomy for chromosome 21 caused by nondisjunc8on during sperm forma8on. c) Monosomy for chromosome 21 caused by a nondisjunc8on during egg forma8on d) A transloca3on involving chromosome 21. e) a and b are equally likely. In the case of transloca8on down syndrome, there are three # 21 chromosomes, just like there are in trisomy 21, but one of the 21 chromosomes is ahached to another chromosome, instead of being separate. This is the less frequent familial form of Down Syndrome 16. Flower color in a par8cular plant species is determined by a single gene as follows: pink flowers are c1c2, white flowers are c1c1, and red flowers are c2c2. In a popula8on the flowers appeared as follows: 500 red, 250 pink, and 250 white. What is the frequency of the c1 allele? a) 0.25 b) 0.375 c) 0.425 d) 0.5 e) None of the above 16. Flower color in a par8cular plant species is determined by a single gene as follows: pink flowers are c1c2, white flowers are c1c1, and red flowers are c2c2. In a popula8on the flowers appeared as follows: 500 red, 250 pink, and 250 white. What is the frequency of the c1 allele? a) 0.25 b) 0.375 c) 0.425 d) 0.5 e) None of the above Here you take the number of white flowers since they are made up en8rely of c1, add them to half of the pink flowers since pink is made up of half c1, half c2, and then divide by the total number of flowers… White flowers (250) + ½ Pink flowers (125) = 375 375/ Total number of flowers (1000) = .375 17. In an ideal popula8on, there are two alleles for a gene. 64% of the popula8on has the dominant phenotype. What is the frequency of the dominant allele? a) 0.8 b) 0.64 c) 0.4 d) 0.36 e) None of the above 17. In an ideal popula8on, there are two alleles for a gene. 64% of the popula8on has the dominant phenotype. What is the frequency of the dominant allele? a) 0.8 b) 0.64 c) 0.4 d) 0.36 e) None of the above Answer: If 64% of the popula8on e...
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