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Test: Sex Determination - NEET MCQ


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10 Questions MCQ Test Biology Class 12 - Test: Sex Determination

Test: Sex Determination for NEET 2025 is part of Biology Class 12 preparation. The Test: Sex Determination questions and answers have been prepared according to the NEET exam syllabus.The Test: Sex Determination MCQs are made for NEET 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Sex Determination below.
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Test: Sex Determination - Question 1

The chromosomal basis of sex determination was discovered by which of the following scientists?

Detailed Solution for Test: Sex Determination - Question 1

The foundation of the chromosomal basis of sex determination was laid down by Henking in 1891. He studied a specific nuclear structure though spermatogenesis in a few insects.

Test: Sex Determination - Question 2

In which of the following organisms, the male heterogametic condition is not observed?

Detailed Solution for Test: Sex Determination - Question 2

Birds do not show male heterogametic conditions. Instead, they show the female heterogametic condition. Male heterogametic condition is characterised by male individuals producing two different types of gametes.

Test: Sex Determination - Question 3

Which of the following determines the sex of the offspring in male heterogametic conditions?

Detailed Solution for Test: Sex Determination - Question 3

When the condition of male heterogamety is present, then sperm determines the sex of the offspring because two kinds of sperms are present, one with X-chromosome and the other with Y-chromosome. Eggs of an individual are the same as both of them contain 22+ X chromosomes.

Test: Sex Determination - Question 4

Which of the following does not show XY type of male heterogametic condition?

Detailed Solution for Test: Sex Determination - Question 4

Grasshoppers do not show XY type of male heterogametic condition. XY type of male heterogametic condition is shown by a number of insects like Drosophila and mammals including human beings and elephants, the males in this type bear two types of sex chromosomes- X and Y type.

Test: Sex Determination - Question 5

What is the probability of having a girl child in sixth pregnancy if the first five progenies are boys?

Detailed Solution for Test: Sex Determination - Question 5

The probability of having a girl child in the sixth pregnancy, where the first five progenies were male is 50%. As humans show XY type of male heterogamety, where 50% sperms carry 22+ X chromosomes and the other 50% carry 22+Y chromosomes, therefore in each pregnancy there is 50% probability of either a male or a female child.

Test: Sex Determination - Question 6

What kind of sex-determination system is present in honey bees?

Detailed Solution for Test: Sex Determination - Question 6
  • Honey bees exhibit a haplodiploid type of sex-determination system.
  • This type of system has special characteristic features like the males produce sperms by mitosis.
  • The male individuals do not have a father and thus cannot have sons, but can have a grandfather and a grandson.
Test: Sex Determination - Question 7
Select the incorrect statement:
Detailed Solution for Test: Sex Determination - Question 7
In domesticated fowls (birds), the sex of the progeny is determined by the type of egg rather than the sperm. Female birds have two types of sex chromosomes (ZW) and males have two Z chromosomes (ZZ). Therefore, Option D is incorrect as the sex of progeny depends on the type of egg, not the sperm.
Test: Sex Determination - Question 8

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:

Detailed Solution for Test: Sex Determination - Question 8

XX-XO method of sex determination: Found in grasshoppers (iii).
XX-XY method of sex determination: Found in humans and many animals where females are homogametic (iv).
Karyotype-45: Associated with Turner's syndrome (i).
ZW-ZZ method of sex determination: Found in birds where females are heterogametic (ii).

Test: Sex Determination - Question 9

Which of the following is correct?

Detailed Solution for Test: Sex Determination - Question 9

This statement is accurate as Drosophila melanogaster, a model organism for genetic research, employs the XX-XY sex determination system similar to humans, where females have two X chromosomes (XX) and males have one X and one Y chromosome (XY).

The other options are incorrect due to the following reasons: a) Henking discovered the X-chromosome, not the Y-chromosome. c) In birds, it is the opposite; females are ZW and males are ZZ. d) Grasshoppers show an X0 sex determination system, where females are XX and males are X0 (having only one X chromosome and no Y chromosome).

Test: Sex Determination - Question 10

What is wrong with respect to sex determination in honey bees?

Detailed Solution for Test: Sex Determination - Question 10

The sex determination in honey bee is based on the number of sets of chromosomes an individual receives. An offspring formed from the union of a sperm and an egg develops as a female (queen or worker), and an unfertilised egg develops as a male (drone) by means of parthenogenesis. This means that the males have half the number of chromosomes than that of a female. The females are diploid having 32 chromosomes and males are haploid, i.e., having 16 chromosomes. This is called as haplodiploid sex-determination system and has special characteristic features such as the males produce sperms by mitosis.

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