Wright BIO 2110 - Rec5_meiotic segregation (5 pages)

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Rec5_meiotic segregation



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Rec5_meiotic segregation

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5
School:
Wright State University
Course:
Bio 2110 - Principles of Molecular and Classical Genetics
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BIO 2110 Genetics Recitation 5 Meiotic Segregation of Allelic Variants Group Members Name 1 Shown below is a diagram of a cell in prophase I of meiosis One pair of homologous chromosomes is shown These chromosomes vary at one gene which has a dominant A allele on one chromosome and a recessive a allele on the other chromosome What gamete genotypes would be derived from this cell What would be the frequencies of these gamete genotypes a aA A 2 Shown below is a diagram of a cell in prophase I of meiosis Two pairs of homologous chromosomes are shown that each vary at one gene One chromosome is heterozygous for the dominant A allele and the recessive a allele The other chromosome is heterozygous for the dominant B allele and the recessive b allele What gamete genotypes would be derived from this cell What would be the frequencies of these gamete genotypes a aA b A bB B 3 Shown below is a diagram of a cell in prophase I of meiosis One pair of homologous chromosomes is shown These chromosomes each vary at two genes being heterozygous for the dominant A allele and the recessive a allele and heterozygous for the dominant E allele and the recessive e allele Recombination occurs between these genes in 20 of meioses What gamete genotypes would be derived from this cell What would be the frequencies of these gamete genotypes a e aA e E A E a e Aa e E 80 no recombination a e aA e E A E 20 recombination A E 4 Shown below is a diagram of a cell in prophase I of meiosis One pair of homologous chromosomes is shown These chromosomes each vary at two genes being heterozygous for the dominant A allele and the recessive a allele and heterozygous for the dominant E allele and the recessive e allele Recombination occurs between these genes in 20 of meioses What gamete genotypes would be derived from this cell What would be the frequencies of these gamete genotypes Are the frequencies of gamete genotypes obtained here the same as the frequencies obtained in question 3 If not why not 80 no recombination a E a E aA E e aA E e A e A e a E 20 recombination Aa E e A e 5 If you mate a male and female together that both were heterozygous at the same two unlinked genes see below what diploid genotypes would be observed in their progeny What would be the frequencies of these progeny genotypes assume you are mating organisms that have a large number of progeny e g praying mantises so you get a large sample size a aA b A bB B


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