In this lab exercise, you are analyzing a set of tetrads from diploids from the
ID: 256981 • Letter: I
Question
In this lab exercise, you are analyzing a set of tetrads from diploids from the Mat A Ura Leu- Ade- 1. Consider the phenotypic ratios from each tetrad. How many genes are segregating in this cross that contribute to the Leu phenotype? Explain. 2. Consider the phenotypic ratios from cach tetrad. How many genes are segregating in this cross that contribute to the Ura phenotype? Explain. 3. Consider the phenotypic ratios from each tetrad. How many genes are segregating in this cross that contribute to the Ade phenotype? Explain.Explanation / Answer
Please find the answers below:
Answer 1: According to the information, the corresponding chromosome carrying the allele for the gene Leu- is altogether absent in the second parent. This would mean that there would be no crossing over for this gene in the parents and hence no segregation of this allele would take place. Resultantly, half the progeny would carry this allele from first parent whereas other half of the progeny would be altogether devoid of this allele.
Answer 2: According to the information, there is no homologous pair of chromosome available for crossing over and segregation for the Ura allele, thus only single type of phenotypes i.e. Ura- would be found in half of the offsprings from this cross.
Answer 3: According to the information, there is no homologous pair of chromosome available for crossing over and segregation for the Ade allele, thus only single type of phenotypes i.e. Ade- would be found only in 50% offsprings from this cross proceeding these parents.
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