LS3.3 BIO1 Review

A “widow’s peak” hairline in humans is coded by the dominant allele W. A straight hairline is coded by the recessive allele w. A man with a homozygous dominant WW produces a zygote with a woman with a heterozygous Ww for the trait. Which allele combinations could occur in the zygote?

• WW or ww

• WW or Ww

• WW only

• Ww only

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

A homozygous tall pea plant (TT) is crossed with a heterozygous tall pea plant (Tt). Which statement is true about the offspring of this cross?

• All of the offspring will have the same phenotype (short), but two different genotypes (Tt, tt).

• All of the offspring will have the same phenotype (short) and the same genotype (tt).

• All of the offspring will have the same phenotype (tall), but two different genotypes (TT,Tt).

• All of the offspring will have the same phenotype (tall) and the same genotype (Tt).

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NGSS.HS-LS3-1

NGSS.HS-LS3-2

Examine this pedigree showing the inheritance of an autosomal trait.

Individuals with the recessive phenotype are shaded darker than those with the dominant phenotype. If this trait is represented with the letter R, what is the genotype of individual B?

• rr

• RR

• Rr

• RR or Rr

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Examine this pedigree showing the inheritance of an autosomal trait.

Individuals with the recessive phenotype are shaded darker than those with the dominant phenotype.

If individual J marries a woman with the recessive phenotype, what is the likelihood that one of their children will also have the recessive phenotype?

• 0%

• 50%

• 75%

• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

The pedigree shows a certain autosomal recessive genetic disorder that is codes for by the allele g.

What is the genotype of individual J?

• GG

• Gg

• gg

• GG or Gg

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

A biologist studying the inheritance of a disease observed that the disease occurred in a family after three generations. The second and third generation showed no symptoms of the disease. She made a pedigree to analyze the inheritance pattern of the disease.

After analyzing the data, what conclusion can the biologist make?

• The disease occurs more often in males.

• The disease is rare in the general population.

• The disease occurs in alternate generations.

• The disease is autosomal recessive.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

The Punnett square shows a cross between two parents. The allele (H) represents the mutated gene that causes Huntington's Disease, while the allele (h) represents an unaffected state.

One parent is affected by Huntington's while the other is unaffected by the disease. What can be concluded about the nature of Huntington's disease?

• The disease is sex-linked recessive.

• The disease is sex-linked dominant.

• The disease is autosomal recessive.

• The disease is autosomal dominant.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

In Hereford cattle, one gene determines whether or not a cow will have horns. The allele that produces horns is recessive (h), and the allele that results in no horns is dominant (H).

If two heterozygous cows mate, what are the predicted phenotypes of their offspring?

• 0% horns, 100% no horns

• 25% horns, 75% no horns

• 75% horns, 25% no horns

• 100% horns, 0% no horns

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

Blood type is an example of a trait controlled by multiple alleles.

What will be the expected outcome for blood typ among children born to these parents according to the cross shown?

• 0% type A; 50% type AB; 0% type B; 50% type O

• 25% type A; 25% type AB; 25% type B; 25% type O

• 25% type A; 50% type AB; 25% type B; 0% type O

• 50% type A; 0% type AB; 50% type B; 0% type O

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

In the snapdragon plant, flower colors red (R) and white (r) show incomplete dominance and result in pink flowers (Rr). A homozygous red-flowed snapdragon is crossed with a homozygous white-flowered snapdragon. What percentage of the offspring produced by this cross would be predicted to have red flowers?

• 0%

• 25%

• 50%

• 75%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2