Genetics Unit

Which allele combination represents a male who has an X-linked recessive disorder?

• X^rY

• X^RY

• X^rX^r

• X^RX^r

Hemophilia is an X-linked recessive disorder that is passed through generations and can be traced by using a pedigree.

In the pedigree that is shown, which represents Irene's allele combination?

• X^hX^h

• X^HX^h

• X^HX^H

• X^hY

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

The results of Thomas Hunt Morgan’s last cross are shown in the Punnett square below.

Which of Thomas Hunt Morgan's hypotheses was valid based on these results?

• White eyes are lethal in female Drosophila.

• White eyes are lethal in male Drosophila.

• Female Drosophila with white eyes are homozygous recessive.

• White eyes are the dominant trait in female Drosophila.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Glaucoma is a leading cause of blindness. Studies have linked a common form of glaucoma to three genes and more than 20 genetic loci. Which best describes glaucoma?

• a recessive trait that requires multiple recessive alleles to be expressed

• a polygenic trait that is influenced by the alleles of several genes

• a codominant trait that is expressed more often when more dominant alleles are present

• a dominant trait that depends on the presence of only one of many dominant alleles

Tags

NGSS.HS-LS3-3

Mary has type A blood. Her son Bill has type AB blood. Which blood type does Bill's dad have if he is homogenous for blood type?

• A

• B

• AB

• O

Tags

NGSS.HS-LS3-1

If a person has type B blood, which statement describes the antibodies present in his or her blood?

• Only anti-A antibodies are present.

• Only anti-B antibodies are present.

• Both anti-A and anti-B antibodies are present.

• Neither anti-A nor anti-B antibodies are present.

Which was most likely an effect on society that resulted from improvements in blood handling during World War I and World War II?

• More soldiers died as a result of incorrect blood typing.

• More soldiers who had lost a limb returned home.

• More donations were needed as a result of poor storage techniques.

• More organizations spoke out against the war.

In peas, yellow seed color (Y) is dominant to green seed color (y). Which describes an organism that has nonidentical alleles for seed color?

• yy and has green seeds

• Yy and has yellow seeds

• YY and has yellow seeds

• Yy and has green seeds

A purebred plant that has yellow flowers is crossed with a purebred plant that has white flowers. All the offspring have yellow flowers. Which conclusion about yellow flowers is supported by these results?

• Yellow flower color is a dominant trait.

• Yellow flower color is a recessive trait.

• Yellow flower color is a heterozygous trait.

• Yellow flower color is a monohybrid trait.

Tags

NGSS.HS-LS3-1

Round seeds and yellow seed color are dominant to wrinkled seeds and green seed color. What is the probability of having offspring that have wrinkled seeds and yellow seed color for the cross RRYY x RrYy?

• 0%

• 25%

• 50%

• 100%

Tags

NGSS.HS-LS4-3