Oogenesis and Follicular Development

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What is the maximum total number of cells that multiply by the 5th month?

15 million

7 million (correct)

1 million

10 million

What is the stage at which primary oocytes are held in a resting state at birth?

Anaphase I

Prophase I

Diplotene stage (correct)

Metaphase I

What is the structure formed by the secretion of glycoproteins during follicular development?

Follicular cell layer

Antrum

Graafian follicle

Zona pellucida (correct)

How many follicles typically mature each month?

15-20 (B) Signup and view all the answers

What is the characteristic of the daughter cells produced after Meiosis I is completed?

They are unequal in size (B) Signup and view all the answers

What is the primary purpose of Meiosis II in oogenesis?

To complete only if the oocyte is fertilized (B) Signup and view all the answers

What is the term for the process by which spermatogonia mature into spermatozoa?

Spermatogenesis (C) Signup and view all the answers

What is the fate of the cell that degenerates around 24 hours after ovulation?

It becomes a polar body (B) Signup and view all the answers

What is the function of the acrosome in spermatozoa?

To facilitate fertilization (D) Signup and view all the answers

What is the primary regulator of spermatogenesis?

Luteinizing hormone (LH) (C) Signup and view all the answers

What is the primary function of meiosis in the human body?

Gamete production (C) Signup and view all the answers

During which week of human development do primordial germ cells move to the wall of the yolk sac?

4th week (D) Signup and view all the answers

What is the term for the process of reducing the number of chromosomes from diploid to haploid in gametes?

Reductive division (A) Signup and view all the answers

What is the outcome of fertilization between a haploid egg and a haploid sperm?

Formation of a diploid zygote (A) Signup and view all the answers

What is the total number of chromosomes present in a human gamete?

23 (B) Signup and view all the answers

What is the approximate incidence rate of Trisomy 13, also known as Patau syndrome?

1 in 3000 (B) Signup and view all the answers

What is the primary significance of meiosis I in sexual reproduction?

It maintains the ploidy of the species across generations (D) Signup and view all the answers

Which syndrome is characterized by a monosomy, where cells have 45 chromosomes with only one X?

Turner syndrome (C) Signup and view all the answers

What is the typical ratio of female to male predominance in Trisomy 13?

3:1 (A) Signup and view all the answers

What is the consequence of the random fusion of haploid gametes during fertilization?

Increased genetic variation in the population (D) Signup and view all the answers

What is the approximate percentage of Trisomy 13 cases that do not survive past one month?

80% (C) Signup and view all the answers

What is the term for a chromosome number that is not an exact multiple of n?

Aneuploid (A) Signup and view all the answers

What is the characteristic of Klinefelter syndrome, in terms of the number of chromosomes in cells?

47 chromosomes (C) Signup and view all the answers

What is the characteristic of Down's syndrome?

Lower-than-normal ratio of the skull's length to its width (D) Signup and view all the answers

What is the approximate incidence of Trisomy 18/Edwards syndrome in newborns?

1 in 6000 (A) Signup and view all the answers

What is the primary difference between prophase I and prophase II in meiosis?

No crossing over occurs in prophase II (B) Signup and view all the answers

During which stage of meiosis do kinetochore microtubules from opposite poles attach to chromosomes?

Metaphase II (C) Signup and view all the answers

What is the result of the depolymerization of kinetochore microtubules in anaphase I?

Homologous chromosomes move to opposite poles (C) Signup and view all the answers

What is the number of haploid daughter cells formed after the completion of meiosis II?

4 (D) Signup and view all the answers

During which stage of meiosis do chromosomes decondense to form chromatin?

Telophase II (B) Signup and view all the answers

During Meiosis II, what is the primary function of separase?

To cleave cohesin proteins between sister chromatids (D) Signup and view all the answers

What is the final number of chromosomes per nucleus after Meiosis II?

23 (B) Signup and view all the answers

What is the result of crossing over during Prophase I of Meiosis I?

Sister chromatids become genetically different (A) Signup and view all the answers

During Meiosis II, what is the outcome of the contraction of kinetochore spindle fibres?

Sister chromatids move towards opposite poles (B) Signup and view all the answers

What is the final number of DNA molecules per nucleus after Meiosis II?

23/2 (B) Signup and view all the answers

What is the result of cytokinesis during Meiosis II?

Four genetically different haploid daughter cells (B) Signup and view all the answers

What is the stage during which nucleoli reappear in each daughter nucleus?

Telophase of Meiosis II (D) Signup and view all the answers

What is the primary function of kinetochore microtubules during Meiosis II?

To direct sister chromatids towards the metaphase plate (D) Signup and view all the answers

What is the outcome of the formation of cleavage furrow during Meiosis II?

Four genetically different haploid daughter cells (D) Signup and view all the answers

During Meiosis II, what is the result of the depolymerization of microtubules?

Kinetochore spindle fibres contract (B) Signup and view all the answers