MCAT Biology : Oogenesis and Spermatogenesis

Study concepts, example questions & explanations for MCAT Biology

varsity tutors app store varsity tutors android store

Example Questions

Example Question #51 : Mcat Biological Sciences

What is a key difference between spermatogenesis and oogenesis?

Possible Answers:

Spermatogenesis results in 4 sperm; oogenesis results in only 1 egg.

Spermatogenesis results in only 1 sperm; oogenesis results in 4 eggs.

Spermatogenesis results in 8 sperm; oogenesis results in only 4 eggs.

Spermatogenesis results in only 1 sperm; oogenesis results in 2 eggs.

Spermatogenesis results in 2 sperm; oogenesis results in only 1 egg.

Correct answer:

Spermatogenesis results in 4 sperm; oogenesis results in only 1 egg.

Explanation:

During spermatogenesis, one spermatogonia will become 4 separate functioning spermatozoa. In oogenesis, a primary oocyte will become 1 functioning ovum (or egg) while 3 polar bodies are also produced, which are nonfunctioning and never become eggs.

Example Question #2 : Oogenesis And Spermatogenesis

When a female ovulates, in what phase of division is the oocyte?

Possible Answers:

Metaphase I

Prophase I

Metaphase II

Prophase II

Anaphase I

Correct answer:

Metaphase II

Explanation:

When a female ovulates, the oocyte is in metaphase II, until it becomes fertilized by a sperm. It then completes the second phase of meiosis to make a mature ovum. Remember that, unlike spermatogenesis, oogenesis begins during development. All oocytes undergo meiosis I during fetal development, and are kept suspended in prophase II until ovulation, when they shift to metaphase II. Meiosis only continues beyond metapahse II if fertilization occurs.

Example Question #31 : Biology

How long does spermatogenesis take in adult humans?

Possible Answers:

72 hours

7 months

2 weeks

25 weeks

64 days

Correct answer:

64 days

Explanation:

Spermatogenesis takes approximately 64 days in adult humans. Males begin producing sperm at puberty, and continue until death.

Example Question #32 : Biology

What is the "Dictyate state?"

Possible Answers:

Pre-vitellegenic stage in fetal development

A meiosis stabilizing factor 

An oogenetic ‘stasis’ between embryo and puberty

The state between fertilization and the start of gonadotropin production

The primordial follicle

Correct answer:

An oogenetic ‘stasis’ between embryo and puberty

Explanation:

Oogenisis halts in the female embryo while the oocytes are trapped in meiosis II. At the beginning of the menstrual cycle a number of oocytes in primordial follicles are stimulated by pituitary gonadotropins to continue maturation.

Learning Tools by Varsity Tutors

Incompatible Browser

Please upgrade or download one of the following browsers to use Instant Tutoring: