Question 1

Which of the following organisms is haploid throughout its life cycle?

Accepted Answer

Dioecious giants

Question 2

In the XX-XO sex determination system, which of the following is true?

Accepted Answer

Females are XX and males are XO

Question 3

Which sex determination system is found in birds?

Accepted Answer

ZZ-ZW

Question 4

What is the function of the SRY gene?

Accepted Answer

It initiates male sex determination

Question 5

According to Lyon's Hypothesis, what is a Barr body?

Accepted Answer

An inactivated X chromosome

Question 6

How many Barr bodies would be present in a human cell with a karyotype of XXXY?

Accepted Answer

$$2$$

Question 7

Which of the following is true about hemizygosity?

Accepted Answer

It refers to having only one copy of a gene in a diploid organism

Question 8

Drosophila melanogaster has how many pairs of autosomes?

Accepted Answer

$$3$$

Question 9

Which of the following karyotypes would result in Turner Syndrome in humans?

Accepted Answer

XO

Question 10

In the genetic balance system, which process is primarily involved?

Accepted Answer

Gene division

Question 11

Which of the following is NOT a major sex determination system?

Accepted Answer

Mitochondrial

Question 12

A human with the karyotype XXY would be classified as:

Accepted Answer

Klinefelter Syndrome

Question 13

Which of the following is a primary pseudoautosomal region of chromosomes?

Accepted Answer

The region where X and Y chromosomes pair during meiosis

Question 14

Which of the following is true about sequential hermaphroditism?

Accepted Answer

An organism changes sex during its lifetime

Question 15

In the ZZ-ZW system, which sex is heterogametic?

Accepted Answer

Female

Question 16

Which of the following is a real-world example of environmental sex determination?

Accepted Answer

Temperature-dependent sex determination in reptiles

Question 17

If a human cell has the karyotype XXXX, how many Barr bodies would be present?

Accepted Answer

$$3$$

Question 18

Which of the following statements about heterogametic sex is correct?

Accepted Answer

It refers to the sex with two different sex chromosomes

Question 19

Which of the following is a consequence of X-inactivation in female mammals?

Accepted Answer

Dosage compensation for X-linked genes

Question 20

Which of the following is true about the number of Barr bodies in a normal human female?

Accepted Answer

$$1$$

Sex Chromosomes and Sex Determination Systems

Study Guide - Practice Questions