24. You are studying the inheritance pattern of a gene you discove t up melanoga

Question

24. You are studying the inheritance pattern of a gene you discove t up melanogaster. Mutations in this gene cause the flies to have miniature wings. You se the following crosses using true-breeding lines and get the results indicated below. 1) Wild-tvpe winged females X Miniature winged males Offspring: All wild-type wings 2) Miniature winged females X Wild-type winged males Offspring: Wild-type winged females Miniature winged males First, what do we call this specific pair of matings? (1 pt) Second, what type of inheritance pattern is exhibited by these crosses? Explain (2 pts)

Explanation / Answer

Answer:

1). It is a reciprocal cross. It is a pair of crosses between a male of one strain and a female of another, and vice versa.

2). The inheritance pattern is called X-linked recessive inheritance.

Wild-type winged allele is dominant over miniature winged allele.

i). XMXM (wild-type female) x (miniature mle) XmY

ii). XmXm (miniature female) x (wild male) XM Y

Xm Y XM XMXm (wild type femle) XMY (wild type mle)

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