Genetics and Punnett Squares Quiz

What does a Punnett square show?

• A Punnett square illustrates the food chain in an ecosystem.
• A Punnett square shows the possible genetic combinations of offspring from two parents.
• A Punnett square predicts the weather patterns.
• A Punnett square shows the physical traits of parents.

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NGSS.HS-LS3-1

NGSS.HS-LS3-2

Which describes a phenotype?

• Genetic makeup of an organism.
• The environment in which an organism lives.
• Observable traits of an organism.
• The evolutionary history of a species.

"Tt" is an example of which genotype?

• homozygous
• hemizygous
• homozygous recessive
• heterozygous

What percentage of offspring will have a recessive phenotype from a Tt x Tt cross?

• 50%
• 25%
• 10%
• 75%

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NGSS.HS-LS3-3

Dominant traits are represented by ___ letters.

• numbers
• uppercase
• symbols
• lowercase

Recessive traits must have ___ copies to be expressed.

• one
• two
• four
• three

In humans, attached earlobes are recessive. What genotype shows attached earlobes?

• aA
• Aa
• AA
• aa

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NGSS.HS-LS3-2

What tool predicts genetic outcomes?

• Punnett square
• DNA sequence analyzer
• Chromosome map
• Genealogy chart

Define homozygous dominant.

• An organism with two identical dominant alleles for a trait.
• An organism with two identical recessive alleles for a trait.
• An organism with one dominant and one recessive allele for a trait.
• An organism with two different dominant alleles for a trait.

Tags

NGSS.HS-LS3-1

Define heterozygous.

• Heterozygous is when an organism has no alleles for a specific trait.
• Heterozygous refers to the absence of alleles for a particular gene.
• Heterozygous is the condition of having two identical alleles for a particular gene.
• Heterozygous is the condition of having two different alleles for a particular gene.