Traits and Probability

Why do we use Punnett Squares?

• To learn times tables.

• To learn chemistry equations.

• To study probability of genes.

• To understand physics.

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NGSS.HS-LS3-3

Study the Punnett Square. What is the probability of having heterozygous dominant traits?

• 0%

• 25%

• 50%

• 75%

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NGSS.HS-LS3-2

What does flipping coins have to do with genetics?

• Absolutely nothing.

• Flipping coins is fun and exciting.

• Genetics involves the probability of traits showing up in organisms.

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NGSS.HS-LS3-3

NGSS.HS-LS4-3

On Mars, it is preferable to have dominant green skin (G) versus red skin (g). A male with heterozygous alleles will have a little Martian with a female that has red skin. Draw a Punnet Square to show their probability for having a green-skinned Martian and then choose the correct answer.

• They will have a 100% to have a green-skinned Martian because the dominant allele will mask the red allele.

• There is 0% chance to have a green-skinned Martian because you need two recessive genes to get the dominant trait.

• There is a 50% chance to have a green-skinned Martian.

Tags

NGSS.HS-LS3-1

Which statement is true about dominant and recessive genes?

• Dominant genes mask recessive genes.

• Recessive genes mask dominant genes.

• They are equal.

Heterozygous means:

• Same alleles. Ex: TT

• Different alleles. Ex: Tt

Who was Gregor Mendel?

• A famous physicist.

• The astronomer who discovered Pluto.

• A priest considered the Father of Genetics.

• A biologist who discovered viruses.

What was Mendel's big discovery?

• Traits are Not passed on to offspring.

• Traits can be masked in one generation and show up in a future generation.

• Pea plants have flowers.

• Pea plants produce peas.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

What is the probability of two coins both landing on heads in one flip?

• 0%

• 100%

• 25%

• 50%

Incomplete Dominance: On Neptune, the genotype for pink skin is Rr. It is preferable to have dominant red skin (R) versus white skin (r). A male with heterozygous pink skin will have a little Neptunian with a female that has white skin. Draw a Punnet Square to show their probability for having a red-skinned Neptunian.

• 50%

• 100%

• 0%

• 25%

Tags

NGSS.HS-LS4-3