Genetics Review

What do you call a section of DNA that codes for a specific trait?

• nucleus
• chromosome
• gene
• DNA

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How many chromosomes are found in human egg and sperm cells?

• 20
• 23
• 26
• 46

__________ worked with pea plants to prove that traits are passed from parent to offspring.

• Reginald Punnett
• Gregor Mendel

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A dominant trait shows up __________.

• only when two dominant alleles are present
• only when one dominant allele is present
• when at least one recessive allele is present
• when at least one dominant allele is present

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NGSS.HS-LS3-1

A recessive trait only shows up when __________.

• two dominant alleles are present
• one dominant allele is present
• two recessive alleles are present
• at least one dominant allele is present

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If you cross two parents, both with genotype Bb, what percentage of children will have brown eyes?

• 25%
• 50%
• 75%
• 100%

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Purebred is another word for __________, while hybrid is another word for __________.

• dominant; recessive
• recessive; dominant
• homozygous; heterozygous
• heterozygous; homozygous

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NGSS.HS-LS3-1

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The two different forms of a gene are called _________.

• zygotes
• traits
• phenotypes
• alleles

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If you cross the genotype GG with genotype Gg, what is the ratio of purebred to hybrid?

• 2:2
• 3:1
• 4:0
• 1:3

What word describes how traits are passed from parent to offspring?

• Alleles
• Dominance
• Probability
• Heredity

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