Question 1

Which gene on the Y chromosome is responsible for initiating the development of testes in an embryo?

Accepted Answer

SRY gene

Question 2

During which weeks of embryonic development is the reproductive system considered sexually indifferent?

Accepted Answer

Weeks 5-6

Question 3

If an embryo has an X egg fertilized by a Y sperm, what will be the genetic sex of the offspring?

Accepted Answer

XY (male)

Question 4

Which embryonic duct develops into the male reproductive tract under the influence of the SRY gene?

Accepted Answer

Mesonephric (Wolffian) duct

Question 5

The development of external genitalia into male or female structures depends primarily on the presence of which hormone?

Accepted Answer

Testosterone

Question 6

Which structure in the embryo develops into the penis in males or the clitoris in females?

Accepted Answer

Genital tubercle

Question 7

What is the primary function of the scrotum in the male reproductive system?

Accepted Answer

To maintain testicular temperature below core body temperature

Question 8

Which muscle contracts to wrinkle the scrotal skin surface, aiding in temperature regulation?

Accepted Answer

Dartos muscle

Question 9

Arrange the following male reproductive ducts in order from proximal to distal: epididymis, urethra, ductus deferens, ejaculatory duct.

Accepted Answer

Epididymis → ductus deferens → ejaculatory duct → urethra

Question 10

A male patient presents with infertility due to elevated testicular temperature. Which process is most likely impaired?

Accepted Answer

Spermatogenesis

Question 11

Which of the following is NOT a primary sex organ?

Accepted Answer

Seminal vesicles

Question 12

If the SRY gene is absent, which duct will persist and develop into the female reproductive tract?

Accepted Answer

Paramesonephric (Müllerian) duct

Question 13

Which of the following best explains why the testes must be maintained at a temperature lower than core body temperature?

Accepted Answer

Lower temperature is necessary for proper sperm production

Question 14

A genetic mutation prevents the formation of the SRY gene. What is the most likely outcome for the embryo's sexual development?

Accepted Answer

Development of ovaries and female reproductive tract

Question 15

Which hormone is secreted by the testes and is responsible for male secondary sex characteristics?

Accepted Answer

Testosterone

Question 16

Which embryonic structure develops into the scrotum in males?

Accepted Answer

Labioscrotal swelling

Question 17

A researcher is studying the effect of testosterone on embryonic development. If testosterone is absent, which of the following is most likely to occur?

Accepted Answer

Development of female external genitalia

Question 18

Which of the following equations correctly represents the genetic determination of male offspring?

Accepted Answer

$$\mathrm{X\ egg} + \mathrm{Y\ sperm} \rightarrow \mathrm{XY\ (male\ offspring)}$$

Question 19

Which of the following is an accessory reproductive organ in males?

Accepted Answer

Seminal vesicle

Question 20

A patient has a mutation that prevents the development of the mesonephric (Wolffian) duct. What is the most likely consequence?

Accepted Answer

Absence of male reproductive ducts

Sexual Differentiation and Male Reproductive Anatomy

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