Genetics Test Part I: Heredity

Which genotype is homozygous?

• XxTt
• XXTt
• xxTT
• Xxtt

A student did an experiment to determine the genetic ratios between a tall pea plant (Dd) and a dwarf pea plant (dd). What phenotypic ratio is expected from the cross between the plants?

• 3 dwarf pea plants, 1 tall pea plant
• 2 tall pea plants, 2 dwarf pea plants
• 3 tall pea plants, 1 dwarf pea plant
• 4 tall pea plants, 0 dwarf pea plants

A cross of chinchillas is made between a father with the genotype BB with a mother (bb). If black hair is dominant to white hair in chinchillas, what are the chances of their offspring having white hair?

• 50%
• 100%
• 25%
• 0%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS4-3

According to Mendel, what kinds of phenotypes are not seen in the offspring of a cross between homozygous dominant and homozygous recessive pea plants?

• Sex-linked
• Dominant
• Recessive
• Autosomal

What conclusion can be drawn from this genetic information?
Parental Generation = Black X White
F1 = All Black
F2 = 75% Black & 25% White
Picture Sheet

• All the white rabbits are heterozygous.
• All the black rabbits in the F generation are homozygous.
• The white parent carried a dominant allele.
• All the F rabbits carried a recessive allele.

Tags

NGSS.HS-LS3-2

NGSS.HS-LS3-1

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?
Picture Sheet

• 2 red, 2 white
• 1 red, 2 pink, 1 white
• 2 red, 1 pink, 1 white
• 1 red, 1 pink, 2 white

Tags

NGSS.HS-LS3-2

NGSS.HS-LS3-1

In squash plants, yellow fruit (Y) is dominant to white fruit (y). If two plants heterozygous for yellow fruit are crossed, what are the possible genotypes of the offspring?

• Yy only
• Yy, yy only
• YY, Yy, yy only
• YY, yy only

Tags

NGSS.HS-LS3-2

NGSS.HS-LS3-1

The pedigree chart shows the inheritance pattern of a disease in a family.  Based on the pedigree chart, what can be concluded about the inheritance pattern of the disease?
Picture Sheet

• The disease is recessive in nature.
• The disease is sex-chromosome linked.
• The disease is more common in female offspring.
• The disease is expressed in every generation.

Tags

NGSS.HS-LS3-1

Black bears come in a variety of colors in North America. The color black is dominant while the color white is recessive. If scientists want to ensure that a litter is produced that will contain 100% black bears, what will the be the genotype of the parents?

• bb x bb and Bb x Bb
• Bb x Bb and BB x bb
• BB x bb and BB x Bb
• BB x Bb and bb x bb

Tags

NGSS.HS-LS3-2

NGSS.HS-LS3-1

Red flower color is dominant to white flower color in rose plants. What is the expected result of a cross between two heterozygous rose plants?
Picture Sheet

• 100% red
• 75% red, 25% white
• 50% red, 50% white
• 25% red, 75 % white

Tags

NGSS.HS-LS3-2

NGSS.HS-LS3-1

NGSS.HS-LS3-3