Exam 4 Review & Notes

C large dele8ons d transloca8ons e monosomy trisomy

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Unformatted text preview: sible 3. Karyotypes can be used to: a) Determine DNA sequences. b) Iden8fy genes on chromosomes. c) Map genes. d) Iden8fy point muta8ons. e) Determine abnormal chromosome numbers. 3. Karyotypes can be used to: a) Determine DNA sequences. b) Iden8fy genes on chromosomes. c) Map genes. d) Iden8fy point muta8ons. e) Determine abnormal chromosome numbers. For this ques8on you have to know what a karyotype is and what you are looking at when view one. Karyotype: The characteriza8on of the chromosomal complement of an individual or a species, including number, form and size of the chromosome 4. Nondisjunc8on can result in: a) FrameshiK muta8ons. b) Gene conversion. c) Large dele8ons. d) Transloca8ons. e) Monosomy. 4. Nondisjunc8on can result in: a) FrameshiK muta8ons. b) Gene conversion. c) Large dele8ons. d) Transloca8ons. e) Monosomy. Trisomy Monosomy 5. For the cross AaBbccDd x AaBbCcdd (all four genes assort independently) the frac8on of progeny that would have the AbCD phenotype is: a) 9/256 (0.035) b) 1/16 (0.062) c)3/64 (0.047) d) 3/256 (0.012) e) None of the above 5. For the cross AaBbccDd x AaBbCcdd (all four genes assort independently) the frac8on of progeny that would have the AbCD phenotype is: a) 9/256 (0.035) b) 1/16 (0.062) c)3/64 (0.047) d) 3/256 (0.012) e) None of the above First draw the punneh square for each cross: A a B b C c D d A AA Aa B BB Bb c Cc cc d Dd dd a Aa b Bb bb c Cc cc d Dd dd aa Then see what the probability is you’ll get the phenotypes listed above: A/- (3/4) b/b (1/4) C/- (1/2) D/- (1/2) Now just mul8ply: (3/4)(1/4)(1/2)(1/2) = 3/64 (0.047) 6. The trait indicated by the filled in symbols is most likely determined by: a) a recessive allele. b) a dominant allele. c) a sex- linked recessive allele. d) a sex- linked dominant allele. e) a sex- limited allele. 6. The trait indicated by the filled in symbols is most likely determined by: a) a recessive allele. b) a dominant allele. c) a sex- linked recessive allele. d) a sex- linked dominant allele. e) a sex- limited allele. The first thing to do here is look at the pedigree and see if you can pick out paherns. 1.  We never see the allele being passed from father to son, so this suggests sex linkage. 2.  The fact that we know it is sex linked, but exhibited by both males and females, suggests that the trait is caused by a dominant allele (e.g. if it was recessive x- linked, males would not display the trait, and a parent would...
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