Question

We crossed pure-bred female flies with yellow body and forked-shaped bristles with male flies extra bristles. The subsequent F1 flies showed all normal phenotypes except that all of the F1 males are yellow-body. We crossed again the normal F1 females with males homozygous for yellow body, extra bristles, and forked bristles as a testcross. The number of each category of F2 progeny is shown below. The mutant allele for yellow body is y; the mutant allele for extra bristles is e; and the mutant allele for forked-shaped bristles is f. The corresponding wild-type alleles for these mutant alleles are indicated with +.

P:         female with yellow body and forked bristles    x       male with extra bristles

F1:       normal female x         male with yellow body, forked and extra bristles

ovau AWN Cat. Obs. No/ Phenotypes 29 yellow body 25 yellow body, forked & extra bristles 28 forked & extra bristles 26 normal 75 extra bristles 74 yellow body, extra bristles 72 forked bristles 71 yellow body, forked bristles Genotypes [x_etof+] [ye f] [xtae,f] [ytastef+] [xtra,f+] [y ,e ,f+] [xtastrof.] [x_etef]

           

Which is incorrect regarding the female F1?

A. This female is heterozygous for the three loci.

B. This female inherited the wild-type allele e+ from the female of the P stage

C. This female inherited the mutant allele e from the male of the P1 stage

D. This female inherited the wild-type allele f+ from the male of the P1 stage

E. This female inherited the mutant allele y from the male of the P1 stage

17. Which wild-type allele y+ was originated from the males of the P stage?

A. y+ allele in the males of Cat 3

B. y+ allele in the males of Cat 4

C. y+ allele in the males of Cat 5

D. y+ allele in the males of Cat 7

E. all of the above

Answer 1

Question 17 is contradictory, as y+ allele is not present in male of P stage, than how male of P stage can pass y+ to F2 generation offspring?

16. © This female inherited the wild type allele ft from male of Pistele. . Actually female inherited all wild allele including ft from female of Pj stage] 17 @ all of the above. I wild take allele yt is present in fo male and that can - pass on to each F₂ genoty be with yot allele:7 Payente yte+oft 0) (gamets) F yay ereftf (All male & female)