Given below are two statements : One is labelled as  Assertion (A) and the other is labelled as Reason (R). 
Assertion (A): In honey bee population, sons do not have fathers but have grandfathers.
Reason (R): Haploidy in drones of honey bee is due to parthenogenesis while fertilisation  results into female bees.
In the light of the above statements, choose the correct answer from the options given below: 
1. Both (A) and (R) are True and (R) is the correct explanation of (A).
2. Both (A) and (R) are True but (R) is not the correct explanation of (A).
3. (A) is True but (R) is False.
4. (A) is False but (R) is True.
Subtopic:  Sex Determination |
 66%
From NCERT
NEET - 2024
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In animal kingdom, along with XX-YY mechanism, many other variants of chromosomal sex determination mechanisms have been described such as XX-XO mechanism, ZZ-ZW mechanism ZZ-ZO mechanism and haplo-diploidy mechanism, which are present respectively in:
1. Birds, Grasshopper, Wasp, Moth
2. Grasshopper, Birds, Moth, Wasp
3. Birds, Moth, Grasshopper, Wasp
4. Grasshopper, Moth, Birds, Wasp
Subtopic:  Sex Determination |
 79%
From NCERT
NEET - 2024
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Select the correct statement/s with respect to mechanism of sex determination in Grasshopper.
A: It is an example of female heterogamety
B: Male produces two different types of gametes either with or without X chromosomes.
C: Total number of chromosomes (autosomes and sex chromosomes) is same in both males and females.
D: All eggs bear an additional X chromosome besides the autosomes.
Choose the correct answer from the options given below:
1. (B) and (D) only 2. (A), (C) and (D) only
3. (A) only 4. (A) and (C) only
Subtopic:  Sex Determination |
 74%
From NCERT
NEET - 2023
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XO type of sex determination can be found in:
1. Monkeys
2. Drosophila
3. Birds
4. Grasshoppers
Subtopic:  Sex Determination |
 83%
From NCERT
NEET - 2022
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NEET 2025 - Target Batch
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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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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 |
 80%
From NCERT
NEET - 2019
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