Genetics Review

Brown eyes (B) is dominant over blue eyes (b). If a person is homozygous dominant has children with someone who is homozygous recessive, what percent of their children would likely have brown eyes?

• 100%

• 75%

• 50%

• 25%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

What percent chance is there of having an offspring who expresses the recessive trait?

• 25%

• 50%

• 75%

• 0%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

Brown hair is dominant over blonde hair. If a person with blonde hair is crossed with a person who is heterozygous for brown hair, what ratio can be expected?

• 0 BB: 2 Bb: 2 bb

• 2 BB: 0 Bb: 2 bb

• 1 BB: 2 Bb: 1 bb

• 2 BB: 1 Bb: 0 bb

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

CROSSING OVER INCREASES

• LIFE SPAN

• GENETIC VARIATION

• THE NUMBER OF OFF-SPRING

• ALL ARE TRUE

Tags

NGSS.HS-LS3-2

This image shows chromosomes during Prophase 1. Which of the following correctly describes the process shown?

• segregation of sister chromatids
• condensation and segregation of alleles
• mutationin which the DNA content of the gene is altered
• crossing - over in which alleles are exchanged

A human muscle cell has 46 chromosomes. How many are in each gamete?

• 11.5

• 23

• 46

• 92

Which is Heterozygous (hybrid)?

• Tt

• BB

• ff

• Dominant

Which is homozygous (purebred)?

• Tt

• BB

• Ff

• Blue

Tags

NGSS.HS-LS3-2

What is the scientific term that refers to sex cells?

• autosome

• gamete

• karyotype

• chromosome

In order for 2 parents to pass down a recessive trait that neither parent expresses, -

• neither parents genotype can contain the recessive trait

• only one parent can have the recessive trait

• both parents must have the recessive trait where it is masked by the dominant trait

• both parents must be homozygous dominant

Tags

NGSS.HS-LS3-1