Genetics

What is a phenotype?

• The expression of a trait; physical appearance.

• refers to the genetic makeup of an individual

• An organism that has the same genes for a trait (ex. TT or tt)

• the passing of traits from parent to offspring

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NGSS.HS-LS3-1

What does heterozygous mean?

• An organism that has the same genes for a trait (TT or tt)

• An organism that has different genes for a trait (Tt)

• When neither gene is fully dominant; offspring is a mixture of both

• the different forms of a trait (hair color--> brown, blonde, red

An allele whose trait only shows up when no dominant allele is present.

• hidden allele

• dominant allele

• recessive allele

• present allele

Two heterozygous (Tt) tall pea plants are crossed. Which describes their offspring?

• 50% tall and 50% short

• 75%tall and 25% short

• 100%short

R=round seed

r=wrinkled seed.

Cross a homozygous round with a homozygous wrinkled. Which statement predicts the results?

• offspring will be Rr

• offspring will be RR

• round seeds will be recessive to wrinkled

• Wrinkled will be observed in half of offspring

W=white hair
w= non-white hair
If you cross a horse with WW and a horse with ww what fraction of the offspring would be expected to have white hair?

• none

• 3/4

• 1/2

• all

Tags

NGSS.HS-LS3-1

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A human usually has _____ total chromosomes.

• 6

• 22

• 4

• 46

Pea plants can have green or yellow seeds. In a pea plant that is heterozygous for seed color, the allele for yellow seeds masks the effects of the allele of green seeds. Which of the following terms best describes the allele for yellow seeds?

• codominant

• recessive

• dominant

• sex-linked

Which of the following alleles is homozygous recessive?

• Tt

• tt

• TT

• T

Tags

NGSS.HS-LS3-1

Two brown eyed parents (Bb) have a baby. What is the chance the baby is blue eyed?

• 0 %

• 25%

• 50%

• 75%

Tags

NGSS.HS-LS3-1

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