STAAR Heredity and Diversity

Giraffes have 30 chromosomes in their somatic cells. How many chromosomes will each daughter cell have after the final step of meiosis?

• 15

• 30

• 45

• 60

Which process occurs between Step 2 and Step 3 and creates more genetic diversity in the resulting cells?

• Chromosome nondisjunction

• Genome replication

• Crossing over

• Chromosomal deletion

Tags

NGSS.HS-LS3-2

Cystic fibrosis is an autosomal recessive disorder in humans. What is the probability that an offspring will have cystic fibrosis if both parents are carriers of cystic fibrosis?

• 25%

• 50%

• 75%

• 100%

Tags

NGSS.HS-LS3-2

NGSS.HS-LS3-1

NGSS.HS-LS3-3

The diagram shows the process of crossing over. Which claim about crossing over in chromosomes is best supported by the diagram?

• Crossing over increases genetic diversity through deletion.

• Crossing over decreases genetic diversity through mutation.

• Crossing over increases genetic diversity by creating new combinations of genes.

• Crossing over decreases genetic diversity by inserting nucleotides into gene sequences.

Tags

NGSS.HS-LS3-2

A white mouse with red eyes is crossed with a black mouse with brown eyes. The white mouse is recessive for both of its traits. The black mouse is dominant for both of its traits.

This cross would be

• BBEE x bbee

• BBEe x BbEe

• BbEE x BbEe

• BBee x BBEE

Tags

NGSS.HS-LS3-2

NGSS.HS-LS3-1

If Green (G) peas are dominant to yellow peas (g) and Round peas (R) are dominant to wrinkled seeds (r), which of the following shows the genotype for a pea plant that is homozygous recessive for yellow, and heterozygous for round?

• GgRr

• GGRr

• GGrr

• ggRr

Tags

NGSS.HS-LS3-2

NGSS.HS-LS3-1

Tall is dominant to short. A homozygous tall plant is crossed with a short plant. What percent of the offspring will be tall??

Tags

NGSS.HS-LS3-1