Genetics Review

An organism's phenotype describes its __________.

• genetic makeup
• physical appearance

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

• nucleus
• chromosome
• gene
• DNA

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

• Reginald Punnett
• Gregor Mendel

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

• Alleles
• Dominance
• Probability
• Heredity

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Scientists use __________ to show what genotype combinations are possible.

• Punnett Square
• Mendel Square
• Madison Square
• Times Square

How many pairs of chromosomes do humans have ?

• 12 pairs

• 23 pairs

• 46 pairs

• 10 pairs

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NGSS.HS-LS3-1

The passing of traits from parent to offspring and including gender is called

• Trait

• Inherited trait

• characteristics

• chromosomes

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Structure made of long chains of DNA and hundreds of thousands of genes is called -

• nucleus

• DNA

• chromosomes

• mitochondria

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