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.
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
The number of autosomes in a human egg would be:
(1) 22
(2) 23
(3) 1
(4) 2
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. |
Match the items of Column - I with Column - II :
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 option from the following:
(a) | (b) | (c) | (d) | |
1. | (ii) | (iv) | (i) | (iii) |
2. | (i) | (iv) | (ii) | (iii) |
3. | (iii) | (iv) | (i) | (ii) |
4. | (iv) | (ii) | (i) | (iii) |
How many autosomes are expected in a kidney cell of humans?
(1) 46
(2) 23
(3) 47
(4) 44
The sex in humans is determined at
(1) fertilization
(2) first trimester of pregnancy
(3) implantation
(4) organogenesis
1. | 2. | ||
3. | 4. |