2. (8 pts) Consider the following crosses in Drosophila. The two traits being in

Question

2. (8 pts) Consider the following crosses in Drosophila. The two traits being investigated involve eye color and the presence or absence of wing crossveins. The outcomes of four crosses are shown below. Phenotype of each Number of offspring of each phenotype parent in crossesorange, orange, red, red, crossveins crossveinless crossveins crossveinless orange, crossveins orange, crossveins red, crossveins red, crossveinless red, crossveinless 0 red, crossveins red, crossveins red, crossveins 83 26 65 71 93 20 18 63 81 28 34 a. (2 pts) Which eye color is dominant and which is recessive? (b) (2 pts)Which wing vein type is dominant and which is recessive? (c) (4 pts) What is the most likely genotype of each parent for each of the four crosses?

Explanation / Answer

A) Red is dominant and orange is recessive because in 2nd n 4th case orange colour drosophila is produced from red parents that means parents are heterozygous but in second cross only red offspring are produced.

B)crossveins are dominant over crossveinsless as crossveinsless wing type Is produced in 4th case though parents are crossveins.

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