33) We cross a Drosophila fly that is homozygote wild-type for three genes with

Question

33) We cross a Drosophila fly that is homozygote wild-type for three genes with a triple 33) mutant purple eyes, black body and curved wings. All these mutants are autosomal recessive. A female from this cross is crossed with a purple black curved male and the offspring is: wildtype 178 purple black curved 181 purple black 10 curved 11 black 17 purple curved 18 black curved 1 purple 2 These genes are linked and you need to decide what gene is in the middle. A) curved B) purple C) the three genes are in different chromosomes D) there is not enough information to decide E) black 34) What is the recombination frequency between black and curved? Note: I do not want the map units 34) between black and curved but the frequency of recombinants between black and curved A) 13% B) 15% C) 3% D) 6% E) 50% 35) Which of the following enzymes is required to link together Okazaki fragments with 35) phosphodiester bonds?

Explanation / Answer

purple color gene is in the middle

the recombination frequency between black and curved is 50%.

the genetic frequency between black and curved is too high that they are very far from each other or on different chromosome hence both gene are far avay from each other and purple is in the middle.

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