Genetics Warmup #1

An individual who has two identical alleles for a particular trait is said to be

• homozygous

• heterozygous

• homologous

• haploid

Answer explanation

Homozygous individuals have identical alleles for a particular trait.

The two forms of a gene are long (S) and short (s). Long (S) is dominant to short (s).

The genotype of a heterozygous individual would be

• SS

• Ss

• ss

Answer explanation

Heterozygous individuals carry both a dominant and recessive allele.

Tags

NGSS.HS-LS3-2

How many alleles does an individual carry for a trait?

• 1

• 2

• 3

• 4

Brown eyes (B) are dominant over blue eyes (b). If a woman has brown eyes and has a blue-eyed child, what must her genotype be?

• BB

• Bb

• bb

Answer explanation

The child must have the genotype bb.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Black hair (B) is dominant to blond hair (b). Which phenotype is expressed in the following genotype?

Bb

• blond hair

• black hair

Answer explanation

The dominant trait (B) is always expressed.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Radish plants have 18 chromosomes in each of its leaf cells. How many chromosomes would most likely be found in a radish ovary?

• 36

• 18

• 9

• 6

Answer explanation

Sex cells are haploid - n. Therefore, they have half the number of the diploid cells - 2n.

The image represents

• incomplete dominance

• co-dominance

• independent assortment

• polygenic inheritance

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

The image represents

• incomplete dominance

• co-dominance

• independent assortment

• polygenic inheritance

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

The image represents a genetic outcome (skin color) where more than one gene is required.

• incomplete dominance

• co-dominance

• independent assortment

• polygenic inheritance

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Who is considered the "father" of modern genetics?

• Einstein

• Mendel

• Disney

• Washington