Which of the following traits of a dog is inherited from its parents?

• the presence of fleas in its fur

• the color of its fur

• the ability to sit up and beg

• the habit of barking to go outside

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The physical expression of a genetic trait is called a

• mutation

• genotype

• crossing over

• phenotype

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The following items are examples of __________.

Items: eye color, hair color, height

• homozygous alleles

• genotype

• heterozygous alleles

• phenotype

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having two of the same genes for the trait (sometimes called purebred).

• homozygous
• hetrozygous
• protein
• chromosome

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having two different genes for a trait (sometimes called hybrid).

• protein
• homozygous
• heterozygous
• genotype

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An allele whose trait only shows up when no dominant allele is present.

• hidden allele
• dominant allele
• recessive allele
• present allele

Which of the following genotypes would be considered heterozygous?

• BB
• gg
• Ff
• TT

Which of the following alleles is homozygous recessive?

• Tt
• tt
• TT
• T

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NGSS.HS-LS3-1

An allele whose trait always shows up in the organism when the allele is present.

• recessive allele
• dominant allele
• hidden allele
• present allele

Who is the father of genetics? 

• Charles Darwin 
• Gregor Mendel
• Dimitri Mendeleev 
• Hans Krebs 

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