Other Types of Sex Determination

Q. State whether true or false:
Among fruitflies, females are homogametic while males are heterogametic.

1. True
2. False

Q.

Males in animals always possess two distinct sex chromosomes, while females have the same sex chromosomes. Which of the following disproves this statement?

1. There are many animals that have XO type of sex determination.

2. In birds, males have the same type of sex chromosome, while females have a distinctive pair.

3. Eggs can never possess the Y chromosome.

4. Sperms can possess either an X or a Y chromosome.

Q.

Sex chromosomes are the primary deciders of the sex in all animals.

1. True

2. False

Q. In Drosophila, the sex is determined by

1. The ratio or pairs of X-chromosomes to the pairs of autosomes
2. Whether the egg is fertilised or develops parthenogenetically
3. The ratio of number of X-chromosomes to the set of autosomes
4. X and Y-chromosomes