Mendelian Genetics

In pea plants, the trait for tall stems is dominant over the trait for short stems. If two heterozygous tall plants are crossed, what percentage of the offspring would be expected to have the same phenotype as the parents?

• 100%
• 75%
• 50%
• 25%

Tags

NGSS.HS-LS3-3

The observable traits of an organism are known as its

• allele
• dominance
• phenotype
• genotype

Tags

NGSS.HS-LS3-3

Each parent contributes one of the genes for a particular trait. The different versions of the genes that can be passed on to offspring are called:

• variables
• gametes
• hybrids
• alleles

Chromosomes that carry genes that code for the same trait, such as hemoglobin (HH/hh) or eye pigment (EE/ee), are said to be:

• homologous

• heterozygous

• heterogeneous

• homozygous

In snapdragons, Tallness (T) is dominant to dwarfness (t). In a cross between two plants that are heterozygous for this trait, the percent of offspring expected to exhibit dwarfness is

•  25%
• 100%
• 50%
• 0%

Tags

NGSS.HS-LS3-3

The color black is dominant in guinea pigs. The phenotypes of homozygous black guinea pigs and heterozygous black guinea pigs are:

• black
• gray
• BB and Bb
• white

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

The gene makeup of an organism for a particular trait is known as its

• dominance
• phenotype
• allele
• genotype

Tags

NGSS.HS-LS3-1

The instruction of one allele covers up (masks) the instruction of the other allele in a homologous pair. Symbolized by a capital letter.

• Recessive Allele

• Dominant Allele

• Heredity

• Trait

The instructions of this allele are covered up by the other allele in a homologous pair. Symbolized by a small letter.

• Homozygous

• Dominant

• Recessive

• Genetics

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

A genotype where only dominant alleles were passed on

from both parents for one trait

BB AA TT LL

• Homozygous Recessive

• Homozygous Dominant

• Dihybrid

• Heredity

Tags

NGSS.HS-LS3-1