9) (12 pts) The ear shape of a new species can be many orientations: lop, curly,

Question

9) (12 pts) The ear shape of a new species can be many orientations: lop, curly, straight, wavy,a short. The following table gives ratios obtained from various matings of animals with different ear shapes. Assume that all traits are 100% penetrant. Cross Ratio of progeny lop X curly curly X curly lop X curly wavy x short lop x short I wavy: 1 lop: 1 curly: 1 straight curly: 1 straight all wa 1 lop: I wavy: 1 short: 1 curly I lop: 1 wavy: 1 short A. How many genes are responsible for ear shape? B. What are the dominance patterms among alleles for cach gene?

Explanation / Answer

A. All the five genes are responsible for the above mentioned ear shapes. Expression of a phenotype is always proportional to its genotype. The genes carry their respective alleles to express their respective shapes (Lop, curly, wavy, straight and short).

B. The dominance patterns among the alleles are wavy and cury. As you can observe them from progeny ratio, these genes express more due to meiotic recombinations. These two genes represent the dominant allelic patterns among all the ear shapes.

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