Fertility, Meiosis, and Genetic Variation

This set of flashcards covers key concepts related to fertility, meiosis, and genetic variation, including definitions, processes, and the significance of genetic diversity.

What is meiosis?

A specialized form of cell division that produces gametes, reducing the number of chromosomes by half.

What are gametes?

Specialized male (sperm) and female (egg) reproductive cells.

What is the significance of crossing over in meiosis?

It allows for the exchange of genetic information between homologous chromosomes, increasing genetic diversity.

What are homologous chromosomes?

Pairs of chromosomes that are the same size and shape and carry the same genes, but may have different alleles.

How many chromosomes do human gametes have?

23 chromosomes, which is half the number found in diploid somatic cells.

What is the role of meiosis in fertility?

Meiosis produces haploid gametes and is essential for sexual reproduction and genetic diversity.

What happens during Prophase I of meiosis?

The nuclear envelope breaks down, microtubules assemble, and chromosomes condense; crossing over may occur.

At what stage of meiosis does crossing over occur?

Crossing over occurs during Prophase I.

What are the phases of meiosis?

Meiosis consists of Meiosis I and Meiosis II, with each having its own phases of prophase, metaphase, anaphase, and telophase.

What are the male reproductive structures involved in gamete production?

Testes, seminiferous tubules, epididymis, vas deferens, prostate gland, and seminal vesicles.

What condition results from nondisjunction in meiosis?

Nondisjunction can lead to conditions like Klinefelter syndrome or Turner syndrome, affecting chromosome numbers.

What is oogenesis?

The process of egg cell (ovum) production in females, including ovulation.

What factors can affect fertility in males?

Age, lifestyle choices (like alcohol use), and anatomical issues can lower sperm production and fertility.

What are the potential consequences of problems with female reproductive anatomy?

Conditions like endometriosis and polycystic ovarian syndrome can disrupt ovulation and lead to infertility.

How does meiosis contribute to genetic variation?

Through mechanisms like crossing over and random alignment of chromosomes during metaphase I, meiosis generates diverse genetic combinations in gametes.

What are the main functions of male reproductive anatomy?

To produce sperm and hormones, deliver sperm to the female reproductive tract, and support fertilization.