MCQs on Developmental Genetics

1 - Question

Haploid spermatids modified into motile spermatozoa by the process called___________ a) Mutation b) DNA repair c) Translation d) Spermiogenesis

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Answer: d Explanation: Primary spermatocyte undergo meiosis and produces spermatids. Spermiogenesis is the process by which haploid spermatids modified to motile spermatozoa.

2 - Question

Spermatids are functionally diploid and genetically haploid. a) True b) False

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Answer: a Explanation: Spermatids are connected by a cytoplasmic bridge, thus considered as functionally diploid and genetically haploid.

3 - Question

. What is the site of spermatogenesis? a) Seminiferous tubules b) Epididymes c) Vasa deference d) Rete testis

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Answer: a Explanation: Seminiferous tubule is the site of spermatogenesis while Vasa deference and epididymes help in sperm maturation.

4 - Question

Which of the following is considered as the source of testosterone? a) Rete testis b) Leyding cell c) Tunica albuginea d) Scrotum

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Answer: b Explanation: Interstitial cells or leyding cell are the sources of testosterone, located between the seminiferous tubule within a lobule.

5 - Question

Name the milk ejection hormone? a) Inhibin b) Prolactin c) Oxytocin d) FSH

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Answer: c Explanation: Oxyticin is released from the posterior pituitary due to the stimulants like sucking by the baby and is considered as milk ejection hormone.

6 - Question

Which of the following provide negative feedback for the release of testosterone? a) Inhibin b) LH c) FSH d) GnRH

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Answer: a Explanation: Whenever concentration of testosterone and ABP increases beyond the threshold level, inhibin inhibits the anterior pituitary and decreases the release of FSH and LH.

7 - Question

Name the hormone which is secreted during puberty? a) GnRH b) FSH c) Oxytocin d) Relaxin

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Answer: b Explanation: FSH is Follicular Stimulating Hormone which stimulates the beginning of puberty and induces primary oocyte to complete its meiosis.

8 - Question

. Which of the following is NOT secreted from corpus luteum? a) Progesterone b) Inhibin c) Relaxin d) FSH

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Answer: d Explanation: Corpus luteum is the chief source of progesterone, which prepares a female for the gestation period by increasing the thickness of endometrium and also by increasing its vascularisation.

9 - Question

. Where does sperm acquire its motility? a) Seminiferous tubules b) Epididymes c) Vasa deference d) Rete testis

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Answer: b Explanation: Sperm acquire its motility in the epididymis after residing here for 18-24 hours.

10 - Question

Which of the following secrete spermatozoa activating substances? a) Epididymes b) Seminal fluid c) Prostate gland d) Seminal vesicle

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Answer: d Explanation: Seminal vesicle secretes spermatozoa activating substances like fructose, citrate, and prostaglandins.

11 - Question

. What is the pattern of cleavage in mammals? a) Radial b) Spiral c) Rotational d) Bilateral

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Answer: c Explanation: The pattern of cleavage in mammals is holoblastic (complete) and rotational. Rotational means first cleavage furrow is parallel to an animal, vegetal axis.

MCQs on Developmental Genetics

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