NGSS.1-LS3-1

If the dominant allele (B) represents brown hair and the recessive allele (b) represents blonde hair, which offspring represents a homozygous recessive genotype?

• BB
• brown
• blonde
• bb

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NGSS.1-LS3-1

A characteristic that an organism can pass on to its offspring through its genes

• protein
• trait
• DNA
• gene

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NGSS.1-LS3-1

W=white hair
w= non-white hair
If you cross a horse with WW and a horse with ww what fraction of the offspring would be expected to have white hair?

• none
• 3/4
• 1/2
• all

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NGSS.1-LS3-1

How many alleles (letters) does a child get from each parent for each trait?

• 1
• 2
• 3
• 4

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NGSS.1-LS3-1

What ratio of the offspring from the cross shown will be purebred recessive for the  trait of tallness? 

• 0 out of 4
• 1 out of 4
• 2 out of 4
• 4 out of 4

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NGSS.1-LS3-1

What is a phenotype?

• The expression of a trait; what you see.
• refers to the genetic makeup of an individual
• An organism that has the same genes for a trait (ex. TT or tt)
• the passing of traits from parent to offspring

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NGSS.1-LS3-1

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

• genotype allele
• dominant allele
• recessive allele
• phenotype allele

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NGSS.1-LS3-1

Genes come in ______

• Pairs 
• Trios
• Singles
• Family Size

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NGSS.1-LS3-1

If (A) represents a large nose and (a) represents a small nose, then what percent of the offspring will have a large nose?

• 25%

• 100%

• 75%

• 50%

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NGSS.1-LS3-1

What percentage of the offspring will be purebred dominant?

• 25%

• 50%

• 75%

• 100%

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NGSS.1-LS3-1