Wednesday, January 3, 2023 - Intro to Meiosis

Types of Reproduction:

Asexual Reproduction

• general info:

  • only one parent needed

  • each offspring is exactly like the parent

  • faster rate of reproduction

  • potential for more offspring

• disadvantages:

  • all offspring inherit all traits, even the “bad” ones

  • no genetic variation

Sexual Reproduction

• general info:

  • creates offspring similar to each parent

  • two parents needed

  • less potential for more offspring

  • half of each parent’s genetics is passed to the offspring

• advantages:

  • genetic diversity

• disadvantages:

  • no control over traits

  • 2 cells required

  • slower population growth

Types of Reproductive Cells:

Reproductive cells are called gametes

Males:

• the male gamete is called sperm

  • sperm is made through spermatogenesis

    • created at puberty (9-18 years) until death

    • four cells are made and are replaced every 24-36 hours

  • sperm cells are stored in the testicles/scrotum

Females:

• the female gamete is called an egg cell/ovum/oocyte

  • egg cells are made through oogenesis

    • initial cells are made during prenatal development

      • will be available as mature cells/puberty (9-18 years)

  • egg cells are stored in the ovary

  • women are born with ~ 300,000 egg cell