Open Sci Ed Genetics

Short tails (T) are dominant to long tails (t). What is the probability of a long-tailed mouse in the cross TT x tt?

• 0%

• 25%

• 50%

• 75%

• 100%

Black fur in mice (B) is dominant to brown fur (b). What is the probability that an offspring will have the same phenotype as its parents in a cross between a homozygous black and a heterozygous black mouse?

• 0%

• 25%

• 50%

• 75%

• 100%

In humans, the presence of dimples is dominant over a lack of dimples. If two people that are hybrids for dimples have children, what can be concluded about the genotypes for the offspring? (choose 2 answers)

• There is a 75% chance that the offspring will have dimples.

• There is a 25% chance that the offspring will not have dimples.

• There is a 50% chance the offspring will be dd AND a 50% chance they will be Dd.

• There is a 50% chance the offspring will be DD AND a 50% chance they will be dd.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

Short tails (T) are dominant to long tails (t) in mice. In a cross between a long-tailed mouse and a short-tailed mouse (Tt), what is the probability of having offspring with long tails?

• 0%

• 25%

• 50%

• 75%

• 100%

Tags

NGSS.MS-LS3-2

In a plant species, the allele for dark green leaves (D) is dominant over the allele for light green leaves (d). A plant with genotype (DD) is crossed with a plant with genotype (dd).

What percentage of the offspring are expected to be hybrid for the leaf color trait?

• 0%

• 25%

• 50%

• 75%

• 100%

What do the two letters of the genotype represent?

• An organism's outward appearance is its phenotype.

• An organism's genotype is a result of its phenotype.

• Genes for a trait come from either the mother or father but not both parents.

• Traits are passed from both parents to offspring through pairs of genes.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Annette has red hair. Annette’s mother has red hair, while her father has brown hair.

Which statement best explains the inheritance of Annette’s hair?

• Annette inherited 100% of her hair color genes from her father.

• Annette inherited 100% of her hair color genes from her mother.

• Annette inherited 50% of her hair color genes from her father and 50% from her mother.

• Annette inherited 25% of her hair color genes from her father and 75% from her mother.

Tags

NGSS.MS-LS3-2

Freckles (F) is dominant to no freckles (f) in humans. Which genotype would result from two parents that are homozygous for freckles?

• FF

• Ff

• f

• ff

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

A mother has brown hair while a father has blond hair. Three of their four children have brown hair while one child has blond hair.

Which statement best explains the reason that three children have brown hair, and only one child has blond hair?

• Three of the four children received the genes for hair color only from their mother, and the gene for brown hair must be a dominant trait.

• All four children received the genes for hair color from both parents, but the gene for brown hair may be a dominant trait.

• All four children received the genes for hair color from both parents, but the gene for brown hair must be a recessive trait.

• One of the four children received the genes for hair color only from their father, and the gene for brown hair may be a recessive trait.