How is an understanding of meiosis required to work Mendelian genetics problems? Explain in terms of...
How is an understanding of meiosis required to work Mendelian genetics problems? Explain in terms of meiotic events and the principle of segregation.
Homework Answers
During meiosis, gamete (haploid) formation occurs in which a diploid cell (2n) is divided into four haploid cells (n). Each diploid cell contains homologous chromosomes and each chromosome has one allele for particular trait. This way, each haploid cell receives only one set of alleles for various traits.
Mendel's first law says that each trait is control by gene which has alternate forms called alleles that may be dominant or recessive. According to second of segregation, alleles are separated during meiosis in such a way that each haploid cell has equal chance of receiving one of the alleles. According to the third law of independent assortment, two genes are assorted independent of each other during meiosis.
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How is an understanding of meiosis required to work Mendelian
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Problem:
Yeast chromosome 3 has these genes in this order: HIS4 LYS1 URA3
ADE2. You have created a diploid strain of this genotype:
You sporulate the diploid and analyze tetrads. Most tetrads show
2:2 segregation for all markers and recombination frequencies that
are consistent with the established genetic map. However, you
notice the one strange tetrad indicated below:
Your goal is to explain how the genotypes of this tetrad arose
during meiosis:
a. Do these spores indicate that...
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Problem:
Yeast chromosome 3 has these genes in this order: HIS4 LYS1 URA3
ADE2. You have created a diploid strain of this genotype:
You sporulate the diploid and analyze tetrads. Most tetrads show
2:2 segregation for all markers and recombination frequencies that
are consistent with the established genetic map. However, you
notice the one strange tetrad indicated below:
Your goal is to explain how the genotypes of this tetrad arose
during meiosis:
a. Do these spores indicate that...
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