Mendelian Genetics

Place each genotype under the correct description:

Groups:

(a) Homozygous Dominant

,

(b) Homozygous Recessive

,

(c) Heterozygous

• CC

• BB

• aa
• Qq

• dd

• Aa
• AA

• Bb

• ww

Tags

NGSS.HS-LS3-1

Recessive alleles are written using

• capital letters

• lowercase letters

• both

• neither

Identify each of the following as an example of a genotype or phenotype:

Groups:

(a) Genotype

,

(b) Phenotype

• tall
• dimples
• blue eyes
• Homozygous Recessive

• Mm

• freckles
• Homozygous Dominant

• curly hair
• short
• AA
• brown hair
• zz

• straight teeth
• Gg

• Heterozygous

Tags

NGSS.HS-LS3-1

Dominant alleles are written using

• capital letters

• lowercase letters

• both

• neither

Which of the following is a phenotype?

• AA
• homozygous recessive

• black fur
• Tt

Tags

NGSS.HS-LS3-3

Tall is dominant to short. A homozygous tall plant is crossed with a short plant. What will be the phenotypes of the offspring?

• 100% tall
• 50% tall, 50% short
• 75% tall, 25% short
• 25% tall, 75% short

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Green is dominant to yellow. Two heterozygous green plants are crossed. What are the genotypes of the offspring?

• 100% Gg
• 50% GG, 50% Gg
• 25% GG, 50% Gg, 25% gg
• 75% Gg, 25% gg

Tags

NGSS.HS-LS3-2

NGSS.HS-LS3-3

Purple is dominant to white. A heterozygous purple flower is crossed with a white flower. What are the genotypes and phenotypes of the offspring?

• 100% Pp (purple)
• 50% Pp (purple); 50% pp (white)
• 75% Pp (purple); 25% pp (white)
• 25% PP, 50% Pp, 25% pp
  75% (purple), 25% (white)

Tags

NGSS.HS-LS3-1

An organism with two different alleles for a trait is said to be: 

• recessive
• heterozygous
• dominant
• purebred

An allele whose trait only shows up when no dominant allele is present.

• hidden allele
• dominant allele
• recessive allele
• present allele