WB Biology Keystone Review "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

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NGSS.HS-LS3-1

NGSS.HS-LS3-2

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

• hidden allele
• dominant allele
• recessive allele
• present allele

R=round seed
r=wrinkled seed.
Cross a homozygous round with a 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

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NGSS.HS-LS3-1

NGSS.HS-LS3-2

A human usually has _____ total chromosomes.

• 6
• 22
• 4
• 46

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NGSS.HS-LS3-1

This type of inheritance pattern is a MIXTURE of both traits.

• incomplete dominance
• co-dominance
• complete dominance
• recessive pattern

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NGSS.HS-LS3-1

Colorblindness is a recessive, X chromosome sex-link disorder. Cross the parents to figure out which percentage of their offspring will be colorblind.

• 25%
• 0%
• 75%
• 50%

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NGSS.HS-LS3-1

This type of inheritance pattern shows BOTH traits in possible offspring

• complete dominance
• incomplete dominance
• co-dominance
• dominant pattern

What type of chromosomal abnormality do people with Down Syndrome have? 

• trisomy 21
• monosomy 21
• recessive inheritance
• dominant inheritance

In fruit flies eye color is carried on the X chromosome. RED is dominant to WHITE. What is the sex and color of the following: X^rY

• female red
• female white
• male red
• male white

Tags

NGSS.HS-LS3-1