3. (1 point) Consider the following crosses in Drosophila melanogaster. Orange a
ID: 254278 • Letter: 3
Question
3. (1 point) Consider the following crosses in Drosophila melanogaster. Orange and red are eye colors; crossveins occur on the wings. red orange, 26 18 Cross Parental Phenotypes orange, crossveined crossveinless crossveinedcrossveinless orange, crossveined X 83 , crossveinless orange 63 81 34 45 red, crossveined X 65 74 93 20 red, crossveinless red, crossveined X ed, crossveinless red, crossveined X red, crossveined 4 28 5 orange, crossveinless X 52 red, crossveinless a) Which eye color trait is dominant and which is recessive (orange or red)? Provide a strong argument to support your answer referring to data from specific crosses. b) Which wing vein trait is dominant and which is recessive (crossveined or crossveinless)? Provide a strong argument to support your answer referring to data from specific crosses. c) For all four crosses above, determine the genotypes of each parent (define your symbols). d) If the red, crossveined parent from c is crossed to the orange, crossveined parent from cross 1, what will be the genotypic and phenotypic ratios of the offspring? Use the branch diagramExplanation / Answer
Answer 3a.
The red color of eye is dominant over the orange color because, we can see that in the cross 4, the progenies have orange color also. This suggests that orange is in recessive stage.
Answer 3b.
Again, in the cross 4, we get that crossveined is dominating over crossveinless.
Answer 3c.
1st parent –
Orange Crossveined = rr Cc
Orange crossveinless = rr cc
2nd parent-
Red Crossveined = Rr Cc
Red crossveinless = Rr Cc
3rd parent-
Red Crossveined = RR/r CC
Red crossveinless = RR/r cc
4th parent-
Red Crossveined = Rr Cc
Red Crossveined = Rr Cc
5th parent-
Orange crossveinless = rr cc
Red crossveinless = Rr cc
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