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📘 Sex Determination MCQ Challenge

Question 1
Sex determination refers to

Explanation: Sex determination is the process by which the sex of an organism is decided.

Question 2
In humans, sex is determined at the time of

Explanation: Sex is determined at fertilization, depending on the sperm type.

Question 3
Total number of chromosomes in humans is

Explanation: Humans have 46 chromosomes (23 pairs).

Question 4
How many pairs of autosomes are present in humans?

Explanation: 22 pairs are autosomes; 1 pair is sex chromosomes.

Question 5
Which chromosomes determine sex in humans?

Explanation: Sex chromosomes (X and Y) determine sex.

Question 6
Human females are

Explanation: Females (XX) produce only one type of gamete → homogametic.

Question 7
Human males are

Explanation: Males (XY) produce X and Y sperms → heterogametic.

Question 8
The chromosomal constitution of human male is

Explanation: Human males have XY chromosomes.

Question 9
The chromosomal constitution of human female is

Explanation: Human females have XX chromosomes.

Question 10
Which parent determines the sex of a child in humans?

Explanation: Father produces X and Y sperms, so father determines sex.

Question 11
Which chromosome carries the SRY gene?

Explanation: The SRY gene responsible for male development is located on the Y chromosome.

Question 12
The SRY gene is responsible for

Explanation: The SRY gene initiates testis development, leading to male sex determination.

Question 13
Absence of SRY gene results in

Explanation: Without the SRY gene, development follows the default female pathway.

Question 14
Which type of sex determination is found in humans?

Explanation: Humans follow the XX–XY type of chromosomal sex determination.

Question 15
XX–XO type of sex determination is seen in

Explanation: Grasshoppers exhibit the XX–XO system of sex determination.

Question 16
In XX–XO system, males are

Explanation: Males possess only one X chromosome (XO).

Question 17
ZZ–ZW type of sex determination is seen in

Explanation: Birds follow the ZZ–ZW system.

Question 18
In birds, which sex is heterogametic?

Explanation: Female birds are ZW → heterogametic.

Question 19
Haplodiploid sex determination is seen in

Explanation: Honey bees follow haplodiploid sex determination.

Question 20
In honey bees, males develop from

Explanation: Unfertilized eggs develop into haploid males.

Question 21
Females in honey bees are

Explanation: Female honey bees develop from fertilized (diploid) eggs.

Question 22
Which sex determination depends on environment?

Explanation: Some reptiles exhibit environmental sex determination.

Question 23
Temperature-dependent sex determination is seen in

Explanation: Crocodiles show temperature-based sex determination.

Question 24
Which chromosome is larger in humans?

Explanation: The X chromosome is larger and contains many genes.

Question 25
The Y chromosome is

Explanation: The Y chromosome is small and contains fewer genes.

Question 26
Sex determination in humans is

Explanation: Human sex determination is genetically controlled.

Question 27
Which gamete decides sex of the offspring?

Explanation: Sperms carry either X or Y chromosome, determining sex.

Question 28
Which chromosome is always present in human ova?

Explanation: Females produce only X-bearing ova.

Question 29
In XX–XY system, male produces

Explanation: Males are heterogametic and produce two sperm types.

Question 30
Sex chromosomes are also called

Explanation: Sex chromosomes are known as allosomes.

Question 31
Individuals with XX chromosomes are

Explanation: XX combination produces female characteristics in humans.

Question 32
Individuals with XY chromosomes are

Explanation: XY combination leads to male development.

Question 33
Which gene triggers male development in humans?

Explanation: The SRY gene on Y chromosome initiates testes formation.

Question 34
Absence of Y chromosome results in

Explanation: Without Y chromosome, default development is female.

Question 35
Male heterogamety means

Explanation: Males produce X-bearing and Y-bearing sperms.

Question 36
Female homogamety means

Explanation: Females produce only X-bearing ova.

Question 37
Which system is seen in birds?

Explanation: Birds show female heterogamety (ZW).

Question 38
In birds, the heterogametic sex is

Explanation: Female birds have ZW chromosomes.

Question 39
Which of the following shows haplodiploidy?

Explanation: Males are haploid, females diploid in honey bees.

Question 40
Haploid males develop from

Explanation: In haplodiploid organisms, males arise from unfertilized eggs.

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