A wild-type Drosophila male and female are crossed, prod...

Question

A wild-type Drosophila male and female are crossed, producing 324 female progeny and 161 male progeny. All their progeny are wild type.

Design an experiment that will test your hypothesis, using the wild-type progeny identified above. Describe the results you expect if your hypothesis is true.

Accepted Answer

Hi, everyone. Let's take a look at this practice problem together. Which of the following genotypes inro Sophal represents a male. The answer options are A X X B X O C X X Y and D. All of the above. So recall that Drosophila sex determination differs from human sex determination. Female sex determinants for Drosophila are on the X chromosome. But unlike humans, male sex determinants are on the autozones. This means that Andros Sophal sex is determined by the X to a ratio where X is the number of X chromosomes and A is the number of sets of autosome. So further looking at the sexes, a male Drosophila would have an X to a ratio of 1-2, which means they would have one X chromosome. Females have an X to a ratio of 1 to and therefore have two X chromosomes. So for this problem, we are essentially counting X chromosomes, genotypes with one X chromosome represent male genotypes with two X chromosomes represent female. So option A X X represents a female. So that is not the correct answer. Then we have option C X X Y. Again, there are two X chromosomes. So this represents female and that Y chromosome in Drosophila does not play a role in determining sex. So C is also incorrect. The correct answer is option B X O. Now, the o in this genotype represents the lack of a second X chromosome. So this genotype represents a male. The correct answer is option B X O. All right, everyone. I hope you found this helpful and I'll see you soon for the next practice problem.

A wild-type Drosophila male and female are crossed, producing 324 female progeny and 161 male progeny. All their progeny are wild type.

Design an experiment that will test your hypothesis, using the wild-type progeny identified above. Describe the results you expect if your hypothesis is true.

Key Concepts

Sex-linked Inheritance

Hypothesis Testing

Progeny Analysis

Watch next

A wild-type Drosophila male and female are crossed, producing 324 female progeny and 161 male progeny. All their progeny are wild type.Design an experiment that will test your hypothesis, using the wild-type progeny identified above. Describe the results you expect if your hypothesis is true.

Key Concepts

Sex-linked Inheritance

Hypothesis Testing

Progeny Analysis

Watch next

A wild-type Drosophila male and female are crossed, producing 324 female progeny and 161 male progeny. All their progeny are wild type.

Design an experiment that will test your hypothesis, using the wild-type progeny identified above. Describe the results you expect if your hypothesis is true.