A Yeast Geneticist Isolates Two Different Haploid Mutant Yeast Strains

question 104

Essay

A yeast geneticist isolates two different haploid mutant yeast strains, Strain A and Strain B, which cannot grow unless the amino acid leucine is added to the growth media.Wild-type yeast strains can make their own leucine and do not require that it be added to the growth media.The geneticist discovers that each mutant yeast strain contains a single recessive mutation that leads to the observed leucine-requiring phenotype.When she crosses the two mutant strains together, she observes that the resulting diploid can grow without leucine added to the growth media.Explain the allelic relationship between the mutations in these two strains.

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Definitions:

Long-Run Average Total Cost Curve

A graphical representation showing the lowest possible cost at which any given level of output can be produced in the long run.

Total Cost Curve

A graphical representation showing the total cost incurred by a firm in the production of goods or services at different levels of output.

Quantity

The volume of a physical or non-physical item or service.

Economies Of Scale

Economies of scale are cost advantages reaped by companies when production becomes efficient, leading to a reduction in the per-unit cost as the scale of operations increases.