Genetics Review

Which process occurs during Prophase I that increases genetic diversity in the resulting gametes?

• Chromosome nondisjunction

• Genome replication

• Crossing over

• Chromosomal deletion

During meiosis, homologous chromosomes pair up and exchange genetic material. What is the significance of crossing over?

• Gametes will have identical genetic information to the parent cell.

• Gametes will inherit chromosomes without any genetic changes.

• Increases genetic variation

• Gametes will lose chromosomes during division.

Tags

NGSS.HS-LS3-2

Polydactyly (the presence of a 6th finger) is caused by a dominant allele (P). If two heterozygous individuals have children, what percentage of their children are expected to have polydactyly? Enter your answer as a whole number percent.

• 25%

• 50%

• 75%

• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

In rabbits, B = black fur and b = white fur. If homozygous dominant and a homozygous recessive rabbit are crossed, what percentage of the offspring are expected to have black fur?

• 100%

• 25%

• 50%

• 75%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

A cross between two unlinked genes is ttRR x TTRr. Which genotype is NOT possible among the offspring?

• TtRR

• TtRr

• ttrr

Which statement best defines genotype?

• The genetic makeup (allele combination) of an organism, such as Aa

• The outward physical traits of an organism, such as blue eyes

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Which option correctly defines phenotype?

• The specific gene sequence present in an organism

• The physical characteristics displayed by an organism, such as blue coloration

• Having two dominant alleles for a trait

• A carrier state that always hides the trait

What is the best explanation for variation in fur color within the same species of rabbits?

• Differences in the nitrogen base sequences of genes

• Differences in the numbers of chromosomes in cells

• Differences in the diets of individual cattle

• Differences in the environmental conditions of different geographic areas

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

An autosomal dominant trait is shown. The shaded shapes are the affected individuals. What would the genotype of II-2 be?

• tt

• TT

• Tt

Tags

NGSS.HS-LS3-1

Using the dihybrid cross and key provided, what is the probability of the offspring being tall and white?

• 9/16

• 2/16

• 3/16

• 6/16

Tags

NGSS.HS-LS3-3