In human child, sex is determined by
1. Size and number of sperms in semen
2. Size of egg to be fertilized
3. Sex chromosomes of father
4. Sex chromosomes of mother
Which of the following statement is correct with respect to human sex determination?
1. The genetic makeup of egg determines the sex of child.
2. Female produces two types of ovums and males produce only one type of sperm.
3. Each pregnancy has more probability of male child than of female.
4. Out of 23 pairs of chromosomes, 22 are same both in males and females.
Assertion : In honey bee, life history shows natural and complete parthenogenesis.
Reason : In honey bee, both drones and workers are parthenogenetically developed.
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
In humans, the mechanism of sex determination is:
1. XX – XY; male heterogamety
2. XX – XY; female heterogamety
3. XX – XO; male heterogamety
4. XX – XO; female heterogamety
Select the incorrect statement:
| 1. | Human males have one of their sex-chromosome much shorter than the other. |
| 2. | Male fruit fly is heterogametic. |
| 3. | In male grasshoppers, 50% of sperms have no sex chromosome. |
| 4. | In domesticated fowls, the sex of progeny depends on the type of sperm rather than the egg. |
| Column-I | Column-II | ||
|---|---|---|---|
| (a) | XX–XO method of sex determination | (i) | Turner’s syndrome |
| (b) | XX–XY method of sex determination | (ii) | Female heterogametic |
| (c) | Karyotype – 45 | (iii) | Grasshopper |
| (d) | ZW–ZZ method of sex determination | (iv) | Female homogametic |
Select the correct answer
| Option | (a) | (b) | (c) | (d) |
|---|---|---|---|---|
| 1. | (ii) | (iv) | (i) | (iii) |
| 2. | (i) | (iv) | (ii) | (iii) |
| 3. | (iii) | (iv) | (i) | (ii) |
| 4. | (iv) | (ii) | (i) | (iii) |
The sex in humans is determined at
(1) fertilization
(2) first trimester of pregnancy
(3) implantation
(4) organogenesis
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