Human Genetics Practice EOC Questions

The inheritance of short wings in Drosophila fruit flies is an x-linked, recessive trait. Which would most likely
result if a short-winged female mates with a long-winged male?

• All offspring will be short-winged.
• All females will be long-winged, and all males will be short-winged.
• All females will be short-winged, and all males will be long-winged.
• Half of the males and females will be short-winged, and half will be long-winged.

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NGSS.HS-LS3-1

A parent with Type A blood and a parent with Type O blood have a child. Which of the following is a possible genotype of their offspring?

• I A I A
• I A i
• I b i
• ii

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Which term is correctly matched with the description?

• Co-dominance occurs when two traits blend together to form a new phenotype.
• Human skin color is an example of codominant  trait.
• Incomplete dominance occurs when traits blend producing a third  phenotype.
• Human blood type is not an example of multiple alleles.

Colorblindness is a sex-linked recessive trait. A mother with normal color-vision and a colorblind father have a
color-blind daughter. Which of the following statements is correct?

• All of their daughters will be colorblind
• The mother is a carrier of the colorblindness gene
• All of their sons will have normal color vision
• All of their sons will be colorblind.

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NGSS.HS-LS3-1

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Which disease most likely occurs after excessive exposure to ultraviolet radiation?

• Malaria
• Asthma
• Skin Cancer 
• Polio

This is a pedigree for a recessive genetic disorder.
What is the genotype of the person in III-2?

• HH
• Hh
• hh
• XY

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Which genetic abnormality can be identified through karyotyping?

• Point mutation
• Recessive allele
• Extra chromosome
• Sex-linked allele

A couple has five children, all with
blood type A. The mother’s blood type
is O, and the father’s blood type is A.
Based on this information, which
describes the most probable genotype
of the father?

• diploid
• haploid
• heterozygous
• homozygous 

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NGSS.HS-LS3-1

In a certain fish, blue (F^B) scales and red (F^R) scales are codominant. When a fish has the genotype F^BF^R, it has a patchwork of blue and red scales. Cross two heterozygous. What are the chances of an offspring being patchwork?  

• 1 out of 4 or 25%
• 2 out of 4 or 50%
• 3 out of 4 or 75%
• 4 out of 4 or 100%

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NGSS.HS-LS3-2

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Colorblindness is a recessive, X chromosome sex-link disorder. Cross the parents to figure out which percentage of their offspring will be colorblind.

• 25%
• 0%
• 75%
• 50%

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NGSS.HS-LS3-1

NGSS.HS-LS3-2