Genetics 1

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

• nucleus
• chromosome
• gene
• DNA

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NGSS.HS-LS3-1

NGSS.HS-LS1-1

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

• Reginald Punnett
• Gregor Mendel

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NGSS.HS-LS3-1

NGSS.HS-LS3-2

An organism's genotype describes its __________.

• genetic makeup
• physical appearance

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NGSS.HS-LS3-1

NGSS.HS-LS3-2

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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NGSS.HS-LS3-1

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

• Alleles
• Dominance
• Probability
• Heredity

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NGSS.HS-LS3-1

NGSS.HS-LS3-2

Scientists use __________ to show what genotype combinations are possible.

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

------is the combination of two alleles that are different from one another.

• homozygous
• heterzygous
• phenotype
• trait

----is the type of gene that always shows itself when present

• genotype
• homozygous
• phenotype
• dominant

Black fur (B) is dominant. Find the probability of a black offspring in a cross: bb x bb. 

• 0%
• 25%
• 50%
• 100%

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NGSS.HS-LS4-3