Genetics

Sex chromosomes are different in male and female. Which statement is correct?

• Males are XX and Females are XY.

• Males are ii and Females are XX.

• Males are XY and Females are XX.

• Males are XY and Females are ii.

Polygenic traits are controlled by more than 1 pair of genes. Give an example.

• Freckles

• Eye Color

• Dimples

• Widows Peak

What helps determine genotypes that are created from organisms mating?

• A test cross

• Mitosis

• DNA replication

• Somatic Cells

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NGSS.HS-LS3-1

NGSS.HS-LS3-2

Which type of allele is masked or hidden in this example: Hh

• The dominant one

• The homozygous one

• The heterozygous one

• The recessive one

True or False: Recessive traits can skip generations and show up in a later cross.

• True

• False

• Umm.. sometimes?

If you have an unaffected woman who is carrying a recessive sex-linked trait on her X chromosome, what is the likelihood she will pass that recessive trait on if she mates with a man who has that recessive trait?

• 0%

• 25%

• 50%

• 75%

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NGSS.HS-LS3-1

NGSS.HS-LS3-2

To have a baby who has type O blood, what allele would each parent HAVE to be carrying?

• Ia

• Ib

• Iab

• i

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NGSS.HS-LS3-1

Hemophilia is considered a sex-linked disorder. Why?

• It only affects one sex.

• It is recessive and carried on a sex chromosome: X.

• It is recessive and carried on a sex chromosome: Y.

• It impacts the sex of the baby that you'll have.

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NGSS.HS-LS3-1

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Why do sex-linked disorders carried on the X chromosome impact males more than females?

• Because males only get one X and if it's affected, they automatically get the disorder.

• Because males have a weaker immune system.

• Because males have 2 X chromosomes.

• Because males are more likely to get bad X chromosomes from their Dad.

Why do we use Punnett squares?

• They show how many traits are passed on

• They show the probability of passing one trait to offspring

• They show how many offspring can be created.

• They show disorders through many generations.

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