9. \"What would be the best explanation to explain the fist mating result that P

Question

9. "What would be the best explanation to explain the fist mating result that Peter got (see the figure below) when he did "Fruit Fly Exercise 1 Level 1', in which wild type male fly is a true line (aka true breeding line) Phenotype description Show Phenotypes Count Female Male 475 (48%) 239 236 525 (53%) 260 265 TOTAL 1000 499 501 Mating site grounded Wildtype M A B. C. The grounded mutant phenotype is recessive The grounded mutant phenotype is dominant, and the female parent fly is homozygous for the mutated gene The grounded mutant phenotype is dominant, and the female parent fly is heterozygous for the mutated gene

Explanation / Answer

9)

Answer is b.

Let us represent wild gene by W and grounded by g

WW * Wg

F1 = WW Wg Ww Wg, so homozygous wild-type shows those features, whereas heterozygous shows grounded features because the grounded phenotype is dominant. If it was recessive F1 would not have a grounded offspring. If it was homozygous and dominant all offspring should have been grounded.

10) since both parents are grounded, so their genotypes must be

Wg * Wg

F2= WW, Wg, Wg, gg, now we see 1/4 probability of wildtype and 3/4 for grounded which does not coincide with data. So the alternative can be that gg is lethal. That gives us 33.3 percent wild type and 66.6 percent grounded, this coincides with data.

Hence the answer is C

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