You are studying heart development in Drosophila and get two animals from a true

Question

You are studying heart development in Drosophila and get two animals from a true-breeding line from a collaborator with a faulty valve. Your collaborator has found that the faulty valve phenotype is recessive to normally functioning valves in wild-type animals. You mate the two females with faulty valves to two wild-type males from your lab. In the F1, all of the progeny have normal valves. You mate an F1 male and female. In the F2, you find that 5 out of 50 have a completely faulty valve. What is a possible explanation?

a. The faulty valve phenotype is 20% penetrant

b. The faulty valve phenotype is 40% penetrant

c. The faulty-valve phenotype is sometimes lethal

d. A or C

e. B or C

Explanation / Answer

Answer d. A or C

The frequency of expression of an allele when it is present in the genotype of the organism =

The 5/50 = 1/10 = 10 %

We calculated from observed value is only 10%. So, some may be lethal. S0, appoxiately we tell 20% penetrant.

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