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Sex determination - PowerPoint PPT Presentation


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Sex determination. We can use a genetic diagram to show how sex (gender) can be determined. The diagram shows how there is an equal chance that each baby will be a girl or a boy. Click to advance the diagram.

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slide2

We can use a genetic diagram to show how sex (gender) can be determined. The diagram shows how there is an equal chance that each baby will be a girl or a boy.

  • Click to advance the diagram.
slide3

We can use a genetic diagram to show how sex (gender) can be determined. The diagram shows how there is an equal chance that each baby will be a girl or a boy.

  • Click to advance the diagram.
slide4

We can use a genetic diagram to show how sex (gender) can be determined. The diagram shows how there is an equal chance that each baby will be a girl or a boy.

  • Click to advance the diagram.
slide5

We can use a genetic diagram to show how sex (gender) can be determined. The diagram shows how there is an equal chance that each baby will be a girl or a boy.

  • Click to advance the diagram.
slide6

We can use a genetic diagram to show how sex (gender) can be determined. The diagram shows how there is an equal chance that each baby will be a girl or a boy.

  • Click to advance the diagram.
slide7

You should note that:

    • Half the male gametes (sperm) have an X chromosome and half have a Y chromosome.
    • However, all the female gametes (eggs) have an X chromosome.
    • Fertilization is random and either type of sperm could fertilize an egg.
    • At each pregnancy, there is a 50:50 chance of conceiving a girl or a boy.
    • In a large population, there will be equal numbers of male and female offspring.
slide8

When constructing a genetic diagram for a monohybrid cross, it is important to follow these conventions:

Show the characteristic of the parents (phenotype).

Show the alleles present in the parents’ cells (genotypes).

Use upper case letters to represent a dominant allele.

Use the lower case version of the same letter to show a recessive allele.

Put gametes in circles.

Show all the different possible combinations of alleles at fertilization.

Put an ‘x’ to show a cross (mating).

slide9

Below is an example of how you might construct a genetic diagram to explain a monohybrid cross between a father who has two alleles for free earlobes and a mother who has two alleles for attached earlobes. Which conventions of drawing genetic diagrams do you recognize?

Offsprings’ characteristics: all have free earlobes but have one dominant and one recessive allele

now have a go at your own punnet squares
Now have a go at your own punnet squares
  • A Blue eyed mum (bb) crossed with a Brown eyed father (BB)
  • A Tortoise shell cat (TT) crossed with a Ginger hair cat (tt)
  • A brown eyed mum (Bb) crossed with a Brown eyed father (Bb)
  • A Red flowered pea plant (Rr) crossed with a Yellow pea plant (rr)
  • A Wrinkled pea (WW) With a Smooth pea (ww)