When more than two versions of a gene for a particular trait exist in the human population, it is a ____________________ trait.

• sex-linked

• polygenic

• epistatic

• multiple allele

A gene that is found on the X or Y chromosome is called a(n)

• codominant gene

• autosomal gene

• somatic gene

• sex-linked gene

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NGSS.HS-LS3-1

Why do humans have a range of phenotype possibilities when it comes to eye color?

• eye color is controlled by the combined effects of many different pigment genes

• the gene for eye color is very long in its DNA sequence and it codes for multiple pigment proteins

• eye color is controlled by sex-linked genes and therefore eye pigments differ between males and females

• eye color is controlled by a recessive allele and pigment is either present or not present

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NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

When two alleles are expressed equally in a heterozygous individual and their phenotype is a blend or mix of the homozygous phenotypes

• polygenic

• incomplete dominance

• codominance

• pleiotropy

A roan cow shows codominance in fur color (brown and white). What is the phenotype ratio expected in offspring a female roan and a male roan mate together?

• All four would be brown and White

• Half would be orange, half would be white

• 2 Brown: 2 Brown and White: 0 White

• 1 Brown: 2 Brown and White: 1 White

Tags

NGSS.HS-LS3-1

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A calico cat expresses the orange allele and black allele equally, having areas of fur with either orange or black pigment. What kind of inheritance pattern is this?

• Incomplete Dominance

• Codominance

• Polygenic

• Multiple alleles

What inheritance pattern is demonstrated in this image?

• Codominance

• Incomplete Dominance

• Simple Dominance

• Epistasis

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NGSS.HS-LS3-1

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True or False: Males always inherit their X chromosome from their mother

• True

• False

If a woman is a carrier for an X-linked recessive trait of hemophilia and her husband has hemophilia, which of the following is true?

• All sons will have hemophilia but daughters would not have hemophilia

• all daughters will have hemophilia

• 50% of daughters and 50% of sons could have hemophilia

• 100% of sons could have hemophilia and 100% of daughters could be carriers

Tags

NGSS.HS-LS3-1

In some carnations, flower color exhibits codominance. When crossed, red (RR) and white (WW) flowers make speckled flowers (RW) that show both colors.

Complete a cross between a speckled flower and a red flower. What would be the phenotypic ratio of thier offspring?

• 1 red: 1 speckled

• 4 red: 0 speckled

• 4 speckled: 0 white

• 1 speckled: 1 white

Tags

NGSS.HS-LS3-3