Genetics

If A is dominant and represents tall, how many off spring would be short?

• 1

• 2

• 3

• 4

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NGSS.HS-LS3-1

NGSS.HS-LS3-2

Black fur(B) in guinea pigs is dominant over white fur(b). Find the probability of a white offspring in a cross between two heterozygous guinea pigs.

• 0%

• 25%

• 50%

• 75%

• 100%

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NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

What does the genotype for a trait BB represent?

• Each letter represents the dominant allele inherited from each parent.

• Both letters represent the dominant allele inherited from the mother.

• Both letters represent the recessive allele inherited from the father.

• Each letter represents the recessive allele inherited from each parent.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Brown fur (B) is dominant to white fur (b) in rabbits. Which genotype would result from two parents that are homozygous for brown fur?

• BB

• Bb

• b

• B

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

The table lists the characteristics of a pea plant and its offspring.

Which statement is true about the characteristics of the pea plant?

• The allele r is dominant over allele R.

• The allele a is dominant over allele A.

• Both the alleles R and A are dominant in nature.

• Both the alleles R and a are dominant in nature.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

How is it possible for an organism to have a recessive phenotype for a trait such as white flowers in pea plants?

• The organism inherits the recessive allele from one parent.

• The organism inherits the recessive allele from both parents.

• The organism fails to inherit the alleles for the trait from either parent.

• The organism acquires the trait from the environment.

Tags

NGSS.HS-LS3-1

What does it mean if a trait is dominant?

• If the trait is present, then the trait is always expressed.

• If the trait is present, then the trait is never expressed.

• If the trait is absent, then the organism will not survive.

• If the trait is absent, then the organism will survive.

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NGSS.HS-LS3-1

Huntington’s disease is a dominant trait that affects brain cells. A student studies a pedigree chart showing the passage of the disease in a family. Huntington’s disease is a dominant trait that affects brain cells. A student studies a pedigree chart showing the passage of the disease in a family.

• All the female members of the family are homozygous recessive and have two recessive alleles, one obtained from each parent.

• All unaffected members of the family are homozygous recessive and have two recessive alleles, one obtained from each parent.

• All the affected members of the family are homozygous dominant and have two dominant alleles, both obtained from one parent.

• All the male members of the family are heterozygous and have one dominant and one recessive allele, both obtained from one parent.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

The trait for dark-colored hair is dominant over the trait for light-colored hair in mice. Which statement correctly represents an example of a phenotype and a genotype for these traits?

• Genotypes dd and Dd result in the light-colored hair phenotype.

• Genotypes dd and DD result in the dark-colored hair phenotype.

• Genotypes Dd and DD result in the dark-colored hair phenotype.

• Genotypes DD and dd result in the light-colored hair phenotype.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Which statement describes the ability of the children passing a recessive gene to their offspring?

• One child can pass the recessive gene to their offspring, and three children cannot.

• Two children can pass the recessive gene to their offspring, and two children cannot.

• Three children can pass the recessive gene to their offspring, and one child cannot.

• Four children can pass the recessive gene to their offspring, and zero children cannot.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2