Genetics Quiz

Mouse Genetics

A mouse with black fur mates with a mouse with grey fur and they produce four offspring. Two of the offspring have black fur and two of the offspring have grey fur. Later, one of the offspring with black fur mates with another mouse with black fur. The cross between them creates three mice with black fur and one mouse with grey fur. The two crosses and the offspring produced are shown.

Which BEST describes a recessive trait?

• A trait that is never present in the phenotype of an organism. 

• A trait that is always present in the phenotype of an organism. 

• A trait that is only expressed if an organism has homozygous alleles, or genes. 

• A trait that is only expressed if an organism has heterozygous alleles, or genes. 

Tags

NGSS.HS-LS3-1

Mouse Genetics

A mouse with black fur mates with a mouse with grey fur and they produce four offspring. Two of the offspring have black fur and two of the offspring have grey fur. Later, one of the offspring with black fur mates with another mouse with black fur. The cross between them creates three mice with black fur and one mouse with grey fur. The two crosses and the offspring produced are shown.

Which mouse fur color is MOST LIKELY the dominant trait?

• Grey, because there is a lower probability of a mouse presenting the grey fur phenotype. 

• Grey, because there is a higher probability of a mouse presenting the grey fur phenotype. 

• Black, because there is a lower probability of a mouse presenting the black fur phenotype. 

• Black, because there is a higher probability of a mouse presenting the black fur phenotype.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

Mouse Genetics

A mouse with black fur mates with a mouse with grey fur and they produce four offspring. Two of the offspring have black fur and two of the offspring have grey fur. Later, one of the offspring with black fur mates with another mouse with black fur. The cross between them creates three mice with black fur and one mouse with grey fur. The two crosses and the offspring produced are shown.

Using the letter b to represent fur color, which incomplete Punnett square displays the MOST LIKELY genotypes of the mice in Cross One?

• 
• 
• 
• 

Tags

BIO.5

BIO.5.c

Mouse Genetics

A mouse with black fur mates with a mouse with grey fur and they produce four offspring. Two of the offspring have black fur and two of the offspring have grey fur. Later, one of the offspring with black fur mates with another mouse with black fur. The cross between them creates three mice with black fur and one mouse with grey fur. The two crosses and the offspring produced are shown.

If the grey mouse from the offspring of Cross Two bred with another grey mouse, what is the MOST LIKELY probability of fur colors in the offspring?

• 100% grey fur

• 100% black fur

• 75% grey fur and 25% black fur

• 50% grey fur and 50% black fur

Tags

BIO.5

BIO.5.c

A black-haired hamster and a brown-haired hamster produce only offspring with black hair.  Joey's hypothesis is that black hair is dominant over brown hair in this species of hamsters.  He then observes that some of the offspring of two black-haired hamsters have brown hair.  How does this prove or disprove Joey's hypothesis?

• It proves that black hair is dominant; both black-haired hamsters must have contributed recessive brown-hair alleles to the brown offspring.

• It disproves that black hair is dominant; all offspring of black-haired parents should have black hair.

• It neither proves nor disproves Joey's hypothesis; the brown hair must have been caused by a genetic mutation.

• It both proves and disproves Joey's hypothesis; black hair and brown hair must be codominant.

Tags

BIO.5

BIO.5.c

Cystic fibrosis is a recessive genetic disorder. Two healthy adults, heterozygous for cystic fibrosis, have a child together. What is the probability of the child being heterozygous?

• 0%

• 50%

• 25%

• 100%

Tags

BIO.5

BIO.5.c

A male with genotype WwZZ is crossed with a female with a genotype Wwzz.  Which of the following allele combinations is possible in a zygote formed from the cross?

• WWZz

• WwZZ

• wwZZ

• WWZZ

Tags

BIO.5

BIO.5.c

In snapdragons, the combined expression of both alleles for flower color produces a new phenotype that is pink. This illustrates incomplete dominance. The Punnett square above shows that both the white and red snapdragons are homozygous. Which of the following would be the correct product from a cross between two heterozygous pink snapdragons?

• 1 red, 1 pink, 2 white

• 2 red, 2 white

• 2 red, 1 pink, 1 white

• 1 red, 2 pink, 1 white

Tags

BIO.5

BIO.5.c

The alleles for red hair and white hair in cattle are codominant. This means that cattle with both red and white alleles will have __________.

• red hair only

• white hair only

• both red and white hair

• either red hair or white hair

Tags

BIO.5

BIO.5.c

In dogs, a type of heredity deafness is caused by the recessive allele d. Which of the following crosses between two dogs minimizes the chances that the offspring inherit this disorder?

• DD x Dd

• Dd x Dd

• dd x dd

• Dd x dd

Tags

BIO.5

BIO.5.c