Biology SB3

The phenotype of an organism

• is used to represent its genetic composition.

• is the physical appearance of a trait.

• occurs only in dominant individuals.

• cannot be seen

Tags

NGSS.HS-LS1-1

A white snapdragon and a red snapdragon produce pink snapdragons when crossed. This is an example of

• pedigree

• multiple alleles

• incomplete dominance

• codominance

Huntington’s disease is caused by a dominant allele. If a woman who is heterozygous for the trait marries a healthy man, what is the chance that their child will have the disease?

• 0%

• 50%

• 75%

• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

If a homozygous dominant individual is crossed with a homozygous recessive individual, what percent of the offspring will have the dominant phenotype?

• 25%

• 50%

• 75%

• 100%

Tallness (T) is dominant to shortness (t) in pea plants. Which of the following represents a genotype of a pea plant that is heterozygous for tallness?

• Tall

• TT

• tt

• Tt

Mendel's law of ____ states that a random assortment of maternally and paternally derived chromosomes in meiosis results in gametes that have different combinations of these genes.

• dominance

• segregation

• independent assortment

• particular inheritance

This type of inheritance pattern shows BOTH traits in possible offspring

• complete dominance

• incomplete dominance

• co-dominance

• shared traits

A red flowered plant (RR) breeds with a White flowered plant (WW). The gene for petal color in these plants expresses incomplete dominance. What percentage of the offspring will have pink (RW) flowers?

• 0%

• 25%

• 50%

• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

A species of mice can have gray or black fur and long or short tails. A cross between black-furred, long-tailed mice and gray-furred, short-tailed mice produce all black-furred, long-tailed offspring. Using the gene symbols G for black, g for gray, S for long and s for short, what would be the genotype of a gray-furred, short-tailed mouse?

• GGSS

• ggSS

• ggss

• GgSs

• Ggss

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

In the chart, the recessive trait is

• no teeth

• sex-linked

• small teeth

• large teeth

Tags

NGSS.HS-LS3-1