Gametogenesis and Puberty Quiz

Questions and Answers

What is the primary result of meiosis in oogenesis?

Four haploid cells that are genetically distinct (correct)

One diploid cell that undergoes further division

Two diploid cells with identical genetic material

Two genetically identical daughter cells

At what stage does oogenesis get arrested before parturition?

Prophase I (correct)

Telophase I

Anaphase I

Metaphase II

What characterizes the cells produced after meiosis I of oogenesis?

They are tetraploid with 92 chromosomes

They are diploid with 46 chromosomes

They are haploid with 23 chromosomes but 46 chromatids (correct)

They are genetically identical to the original cell

During which phase of meiosis does crossing over occur?

Prophase I Signup and view all the answers

What type of cell division is mitosis classified as in oogenesis?

Equational division Signup and view all the answers

What type of cells do primary germ cells differentiate into in the ovary during fetal development?

Oogonia Signup and view all the answers

What is the chromosomal complement of a primary oocyte during prophase I of meiosis?

2N & 4C Signup and view all the answers

Which process introduces genetic variation during meiosis?

Homologous recombination Signup and view all the answers

What event occurs at the ovulatory surge of LH?

Meiosis I is completed Signup and view all the answers

What is the purpose of polar bodies formed during oocyte development?

To reduce the genetic material Signup and view all the answers

How many genetically distinct gametes can potentially be produced due to independent assortment in humans?

8 million Signup and view all the answers

At which stage are most mammals born in relation to oogenesis?

In prophase I Signup and view all the answers

What is formed as a result of Meiosis I in oogenesis?

One secondary oocyte and one polar body Signup and view all the answers

During which meiotic phase do homologous chromosomes exchange genetic material?

Prophase Signup and view all the answers

What is the total number of chromatids present after crossing over in homologous chromosomes?

46 Signup and view all the answers

At what stage of meiosis does the secondary oocyte get arrested?

Metaphase II Signup and view all the answers

What occurs during ovulation?

The oocyte is released from the follicle. Signup and view all the answers

Where does fertilization typically occur?

In the ampulla of the uterine tube Signup and view all the answers

What happens to the polar body after meiosis?

It degenerates. Signup and view all the answers

What is the genetic composition of an ovum?

n Signup and view all the answers

Which cells are responsible for testis development?

Sertoli cells Signup and view all the answers

What is a primary germ cell called after it differentiates?

Spermatogonium Signup and view all the answers

What is the duration of the fertilization window after ovulation?

6-12 hours Signup and view all the answers

Which factor is crucial for the development of Leydig cells?

AMH Signup and view all the answers

What role do Sertoli cells play in spermatogenesis?

They phagocytose residual cytoplasm. Signup and view all the answers

What is the primary function of Leydig cells in male physiology?

To produce testosterone. Signup and view all the answers

What is the significance of the blood testis barrier?

It prevents an autoimmune response to sperm. Signup and view all the answers

What type of cell is a spermatogonium?

Undifferentiated male germ cell. Signup and view all the answers

Which hormone is produced by Sertoli cells?

Estradiol. Signup and view all the answers

During which developmental stage do male mammals develop spermatogonium?

Fetal stage. Signup and view all the answers

Study Notes

Oogenesis Overview

Oogenesis involves mitosis and meiosis for the formation of ova.
Starts before parturition; oogonia (2n) undergo mitosis to form primary oocytes.
Primary oocytes (2n & 4C) enter prophase I and get arrested until puberty.

Mitosis and Meiosis

Mitosis produces two genetically identical diploid cells.
Meiosis reduces chromosome number, creating four haploid cells.
Crossing over occurs during meiosis I, promoting genetic diversity.

Meiosis Details

Meiosis I separates homologous chromosomes; produces secondary oocyte and polar body.
Secondary oocyte undergoes meiosis II, arrested at metaphase II until fertilization.

Polar Bodies

Polar bodies arise from meiosis to reduce genetic material.
Do not contribute to embryo development; degenerate post-formation.

Ovulation Process

Ovulation releases the secondary oocyte from the follicle.
Meiosis continues post-ovulation, blocked at metaphase II unless fertilized.
Fertilization typically occurs in the ampulla of the uterine tube.

Male Fetal Life

Spermatogonia originate from primary germ cells in fetal life.
Undergo mitosis to produce diploid cells capable of forming sperm.
Sertoli and Leydig cells develop, influenced by testosterone and other factors.

Spermatogenesis

Spermatogenesis involves transformation from spermatogonia to sperm.
Lower temperature (34 °C/93 °F) is optimal for sperm development.
Requires 60 days overall for sperm maturation and transportation through the epididymis.

Sperm Structure

Consists of head (with acrosome), midpiece (with mitochondria), and tail.
Acrosome contains enzymes necessary for fertilization.

Role of the Epididymis

Epididymis serves for sperm storage and maturation.
Sperm gain motility and fertilization capability while in transit through the epididymis.

Puberty in Reproductive Competence

Marked by gamete production and mating behavior changes.
Increased secretion of GnRH and sensitivity to sex hormones.
Both sexes show signs of reproductive readiness, with females acquiring cyclicity and males producing mature sperm.

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Description

Test your knowledge on gametogenesis and puberty with this quiz. Explore the concepts of oogenesis, somatic cells, and the stages of cell division. This quiz is designed for students studying theriogenology and related fields.