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

Subtopic:  Sex Determination |
 93%
From NCERT
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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.

Subtopic:  Sex Determination |
 91%
From NCERT
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The number of autosomes in a human egg would be:

(1) 22

(2) 23

(3) 1

(4) 2

Subtopic:  Sex Determination |
 89%
From NCERT
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Males produce two types of gametes in

1. Butterflies

2. Birds

3. Drosophila

4. Moth

Subtopic:  Sex Determination |
 86%
From NCERT
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Which of the following pair is wrongly matched?

1.  Factors   -   Discrete units

2.  Multiple alleles  -  ABO blood group

3.  Female Drosophila  -  Heterogametic

4.  Inborn error   -   Phenylketonuria

 

Subtopic:  Sex Determination |
 87%
From NCERT
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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.
Subtopic:  Sex Determination |
 68%
From NCERT
NEET - 2019
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Read the following four statements (A-D)

A.  The characters never blend in heterozygous condition.

B.  Change in a single base pair of DNA does not cause mutation.

C.  Cancer cells commonly show chromosomal aberrations.

D.  In chicken, sex chromosomes in males are ZW and in females are ZZ.

How many of the above statements is/are right?

1.  Two

2.  Three

3.  Four

4.  One 

Subtopic:  Sex Determination | Sex Determination: Further Considerations |
 56%
From NCERT
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Males are heterogametic and females are homogametic in

1.  Human beings and birds

2.  Fruit fly and butter fly

3.  Grasshopper and cockroach

4.  Birds and silkworm 

Subtopic:  Sex Determination | Sex Determination: Further Considerations |
 55%
From NCERT
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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)
Subtopic:  Sex Determination | Sex Aneuploidy - Turner & Klinefelter Syndrome |
 79%
From NCERT
NEET - 2019
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