9) (12 pts) The ear shape of a new species can be many orientations: lop, curly,
ID: 272526 • Letter: 9
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
9] A. Four genes are responsible for ear shape . They are- curly , straight, short and lop shapes.
We can say this because each trait is distinct and can express itself as an independent trait in the various crosses. Only the wavy shape is the result of codominance of curly and straight shape .
This is why, in the cross between lop and curly, we get 4 ear shapes-- lop, curly, wavy and straight.
The cross between curly and curly gives 3 curly and one straight.
B] The inheritence pattern shows that each trait can express itself independently.
The wavy shape which is most probably a result of codominance between curly and straight shape, can seggregate independently in further generations.
Lop and wavy seem to be linked with the wavy shape dominant over the lop shape .
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