Chapter 10-Mendelian Genetics

The physical expression of a trait is called the ...

• genotype

• phenotype

Segments of DNA that code for traits are called ....

• genes

• proteins

• alleles

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Genotype: TT

• homozygous dominant

• homozygous recessive

• heterozygous dominant

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Genotype: Aa

• homozygous dominant

• homozygous recessive

• heterozygous dominant

Cross 2 heterozygous tall pea plants. Tall (T) is dominant to short (t). What fraction of the offspring do you predict will be tall?

• 1/4

• 2/4

• 3/4

• 4/4

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NGSS.HS-LS3-1

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Which statement below describes DOMINANT alleles?

• expressed when at least one is present

• only expressed when 2 are present

Which of the following is a PHENOTYPE for flower color in pea plants?

• Pp

• PP

• Purple

The trait or allele that is expressed when only one is present is called the ___________ trait.

• dominant

• recessive

In pea plants, tall (T) is dominant over short (t). If two heterozygous tall pea plants are mated, what is the the expected genotypic ratio of their offspring?

• 3 tall : 1 short

• 1 TT : 2 Tt : 1 tt

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NGSS.HS-LS3-1

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In humans, freckles (F) on the skin are dominant to no freckles (f).  If a heterozygous parent and a recessive parent conceive, what is the chances of having a child with NO FRECKLES?

• 0%

• 50%

• 100%

Tags

NGSS.HS-LS3-1

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