Other Types of Sex Determination

Q.

Assertion (A): The sex of a child in human beings will be determined by the type of chromosome he/she inherits from the father.

Reason (R): A child who inherits the ‘X’ chromosome from his father would be a girl (XX), while a child who inherits a ‘Y’ chromosome from the father would be a boy (XY).

1. Both (A) and (R) are true and (R) is the correct explanation of the assertion (A).

2. Both (A) and (R) are true, but (R) is not the correct explanation of the assertion (A).

3. (A) is true, but (R) is false.

4. (A) is false, but (R) is true.

Q.

How many pairs of sex chromosomes are found in human beings?

Q. In Drosophila, XXY represents a female but in human it is an abnormal male. It shows that

1. Y-chromosome is essential for male sex in human.
2. Y-chromosome is essential for female sex determination in Drosophila.
3. Y-chromosome is not essential for male sex determination in human.
4. All of the above

Q.

In human males, all the chromosomes are paired perfectly except one. This/these unpaired chromosome is/are (i) large chromosome (ii) small chromosome (iii) Y-chromosome (iv) X-chromosome

1. (i) and (ii)

2. (iii) only

3. (iii) and (iv)

4. (ii) and (iv)

Q. Why does the haploid drone bee not have a father and cannot have sons, but have a grandfather and can have grandsons?

Q.

In which of the following organisms do males develop from unfertilized eggs and females develop from fertilized eggs?

1. Honeybee

2. Pigeon

3. Snapping turtle

4. Alligator

Q. What is heterogamety? Explain the mechanism of sex determination in Drosophila. [3 Marks]

Q. Individuals who have homomorphic sex - chromosomes produce

1. two types of gametes
2. no gametes
3. one type of gamete
4. only one gamete in a complete life span

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. Eggs can never possess the Y chromosome.

2. All of the above

3. There are many animals in which the sex chromosomes are switched.

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

Q. In Drosophila, the sex is determined by

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

Q.

Why is female bird referred to as heterogametic?

Q. In honeybees, females are (i) having (ii) chromosomes and males are (iii) having (iv) chromosomes.

1. (i) Diploid, (ii) 46, (iii) Haploid, (iv) - 23
2. (i) Haploid, (ii) 23, (iii) Diploid, (iv) - 46
3. (i) Diploid, (ii) 32, (iii) Haploid, (iv) - 16
4. (i) Haploid, (ii) 16, (iii) Diploid, (iv) - 32

Q. Describe haplodiploid sex determination system in honey bees.

Q.

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

1. True

2. False

Q. How is sex determined in human beings?

Q. Who decides the sex of the baby mother or father? Explain with a flow chart?

Q. What is meant by...
In honey bee, males don't have fathers & thus can't have sons...but have a grand father & can have grand sons...??

Q. The information given is about the kind of reproduction in an animal. Identify the animal.

1. Ostrich
2. Hen
3. Frog
4. Snake

Q. Sexually reproducing organisms contribute in their offspring

1. All of the genes
2. One half of their genes
3. One fourth of their genes
4. Double the number of genes.

Q. Name one reptile in each case where higher incubation temperature leads to the development of : (a) male progeny, (b) female progeny.

Q. A male honeybee has 16 chromosomes whereas its female has 32 chromosomes. Give one reason.

Q. The type of sex determination in honey bee is

1. Diploidy
2. Haplo-diploidy
3. ZZ - ZW
4. Haploidy

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

1. True
2. False

Q. Which type of Drosophila is produced, if (AA + X) ovum fertilizes with (A + Y) sperm?

1. $0.67$, Sterile
2. $0.33$, Super male sterile
3. $0.67$, Inter sex sterile
4. $0.5$, Normal male

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. Drosophila is metamale with chromosomal formulation.

1. $2A+3X$
2. $3A+3X$
3. $4A+3X$
4. $3A+XY$
5. $2A+XY$

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

Q.

In which of the following organisms do males develop from unfertilized eggs and females develop from fertilized eggs?

1. Honey bee

2. Pigeon

3. Snapping turtle

4. Alligator

Q. With the help of a chart, explain the method of sex determination in honeybees.

Q.

How is that a honeybee reproduces parthenogenetically but also have males/drones?