If purple (P) is dominant to white (p) and axial (A) is dominant toterminal (a),

Question

If purple (P) is dominant to white (p) and axial (A) is dominant toterminal (a), and in a cross of white, axial to purple, axial theratio of offspring is 3/8 white, axial; 1/8 white, terminal; 3/8purple, axial; 1/8 purple, terminal, then what is the genotype ofthe parents?



a. PpAa X ppAa

b. PpAa x PpAa

c. PpAa X Ppaa

d. PPAA X ppaa

e. Ppaa X Ppaa

Scalloped (sd) wing is an X-linked recessive and ebony (e) body color is an autosomal recessive mutation in Drosophila. What proportion of scalloped, normal body colored males is expected in the F2 starting with a true breeding scalloped female which is wild type for ebony mating with a true breeding male mutant only for ebony.



   a.    0

   b.    1/32

   c.    1/16

   d.    1/8

   e.    3/16

Scalloped (sd) wing is an X-linked recessive and ebony (e) body color is an autosomal recessive mutation in Drosophila. What proportion of scalloped, normal body colored males is expected in the F2 starting with a true breeding scalloped female which is wild type for ebony mating with a true breeding male mutant only for ebony.



   a.    0

   b.    1/32

   c.    1/16

   d.    1/8

   e.    3/16

Explanation / Answer

d. PPAA X ppaa c. 1/16

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