DNA Revolution - Inheritance of Sex

A short explainer about the inheritance of sex for year 10 students.

BiologyScienceInheritance
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DNA Revolution - Inheritance of Sex

Created 2 years ago

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A short explainer about the inheritance of sex for year 10 students.
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Slide Content
  1. DNA Revolution

    Slide 1 - DNA Revolution

    • The Inheritance of sex
    • Dr Eliot Attridge 2015
  2. What makes a male a male?

    Slide 2 - What makes a male a male?

    • There are 23 pairs of chromosomes
    • One pair is the sex chromosomes
    • If you get two X chromosomes, you are genetically female
    • If you get an X and a Y chromosome, you will be genetically male
  3. So, is that it- XY = male?

    Slide 3 - So, is that it- XY = male?

    • It is not just the carrying of an X and a Y chromosome that is important
    • A lot of harm is done by assuming XY makes you male
    • During development of the fetus, the Y chromosome causes the production of a male sex hormone, Androgen.
    • If a person lacks Androgen receptors, the body continues developing as a female
    • They will have all the sex characteristics as a female, apart from a uterus.
    • They will be unable to have children
  4. Chances of boys and girls

    Slide 4 - Chances of boys and girls

    • Assuming that a pregnancy is normal, what are the chances of getting a baby girl or boy?
    • We can use Punnett squares to work out the odds:
    • Male (XY)
    • Female (XX)
    • X
    • Y
    • X
    • X
  5. Quick question

    Slide 5 - Quick question