Inheritance Genetics

An organism that contains two different alleles for a trait is said to be _______ for that trait.

• dominant

• heterozygous

• homozygous

• recessive

There are two types of pea plants: those that produce round seeds and those that produce wrinkled seeds. A single gene controls which type of seed a pea plant will produce.

An experiment shows that pea plants containing an allele for wrinkled seeds may still produce round seeds.

Based on this information, we can conclude that the allele for wrinkled seeds in pea plants is _______.

• recessive

• dominant

• heterozygous

• homozygous

An organism that contains two of the same alleles for a trait is said to be _______ for that trait.

• dominant

• heterozygous

• homozygous

• recessive

In a particular type of cat, coat color follows the dominant/recessive pattern of inheritance. The allele for a brown coat (B) is dominant to the allele for a white coat (b).

A cross between two white-coated cats would result in

• white-coated kittens only.

• brown-coated kittens only.

• white-coated kittens with brown spots.

• white-coated kittens or brown-coated kittens.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

In a particular type of cat, coat color follows the dominant/recessive pattern of inheritance. The allele for a brown coat (B) is dominant to the allele for a white coat (b).

One of Mariam's cats is homozygous dominant (BB) and the other cat is heterozygous (Bb). Which of the following is true about Mariam's cats?

• They have the same genotype but different phenotypes.

• They have different genotypes but the same phenotype.

• They have the same genotype and the same phenotype

• They have different genotypes and different phenotypes.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

_________ can be described as alternate forms of a particular gene.

• Chromatids

• DNA molecules

• Chromosomes

• Alleles

If an organism is homozygous for a particular trait, the organism

• is missing alleles on the chromosomes in a chromosome pair.

• has extra alleles on both chromosomes in a chromosome pair.

• has the same allele on both chromosomes in a chromosome pair.

• has different alleles on the chromosomes in a chromosome pair.

Tags

NGSS.HS-LS3-1

A rabbit is carrying a dominant allele for brown hair (B) and a recessive allele for white hair (b). What is the rabbit's genotype?

• Brown Hair

• White Hair

• BB

• Bb

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Opsins are proteins that are found in the light-sensing cells in the human eye. Different opsin proteins are sensitive to different colors of light. The instructions for creating the type of opsin sensitive to red light are found on a gene known as OPN1LW, which is on the X chromosome.

A genetic mutation in the OPN1LW gene can lead to a form of color blindness that affects a person's ability to detect red light. However, women have two copies of the X chromosome, and they have normal color vision if only one copy contains the mutation.

Why do women who carry one copy of the mutated gene still have normal color vision?

• The cell is able to use proteins other than opsin to detect red light when not enough opsin is produced.

• The body detects that a mutation has taken place, so it relies on the other copy of the chromosome for instructions.

• The non-mutated OPN1LW gene makes enough opsin to allow the cells to detect red light.

• The mutated OPN1LW gene is repaired by the non-mutated gene on the other chromosome.

Tags

NGSS.HS-LS1-1

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Organisms typically have more than one form of each gene. If one form can mask the appearance of another form, that form is considered _______ the other form.

• Better than

• Worse than

• Dominant Over

• Recessive to