Question

Hi everyone! In Drosophila, genes a and b control body size and color, respectively. . .I am so bad at crossing over please help me

Question 6: (3 points) In Drosophila, genes a and b control body size and color, respectively. Large body (a+) is dominant over miniature (a), and gray body (b+) is dominant over ebony (b). The two genes are located at positions 32.0 and 40.0 on a particular autosome. Note that crossing-over does not occur in males. A miniature female that is homozygous for b+ was mated with an ebony male that is homozygous for a . All the offspring were phenotypically wild-type (large body and gray). a. What types of gametes will be produced by the Fı females, and in what percentages? b. What types of offspring would you expect in the F2 generation, and in what percentages?

Answer 1

at large body, a = miniature, bt grey bedy , b = ebony fsnate qa6tot male atat bb abt ath (F ) aatbbt (wild type) - Lorge body & grey body ab 546% a bt - 40% as a and b genes are 8 CM atb - 4% (40-32) = 8 CM distance atbt -46% on selling I ab abt I atb a tht aabb 21.1% aab+b 18.4% 9 ta bb 1.8429 tabtbl.is laabt aa6+6 167 ata bt 2.16 a ta 6tht 1.89% athe ata bb 2 Pootabtboldatat bb albfotat 66 184 stabb ata bth, 8.4pat at bb, 1897 a tot 67 9b abt gtht 21:1626 17. abxaba aalb= 46% +46% = 21,16% some done for other genotype also

Hope it's clear..Thanks