Heredity Unit Test Review

Two heterozygous purple-flowering pea plants are crossed. If purple is dominant over white, what are the expected phenotypic results?

• 25% purple, 75% white.

• 75% purple, 25% white

• 100% purple

• 50% purple, 50% white

Tags

NGSS.HS-LS3-3

What law BEST explains why an organism with ‘Ttʼ will show only the dominant phenotype?

• Law of Dominance

• Law of independent assortment

• Law of segregation

• Chromosome theory of inheritance

If an organism inherits one dominant allele and one recessive allele for eye color, their genotype would be:

• heterozygous

• homozygous

• homologous

• haploid

Two parents have the genotype Gg for a genetic disorder caused by a recessive allele. What is the chance that any of their children will inherit the disorder?

• 50%

• 25%

• 75%

• 100%

Tags

NGSS.HS-LS3-3

Which Mendelian law of inheritance states that organisms inherit two copies of each gene and donate one copy to each of their offspring?

• Chromosome Theory of Inheritance

• Law of Segregation

• Law of independent assortment

• Law of dominance

In pigs, the allele for a wavy, rough coat (R) is dominant to the allele for a soft, fine coat (r). A rough coat boar and a soft coat sow mate. They produce several litters, 50% are rough coat and 50% are smooth coat. What must be the genotypes of the

parents to create this phenotypic ratio?

• Rr x Rr

• Rr x rr

• RR x Rr

• RR x rr

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

Imagine two heterozygous parents. Each has a dominant allele (B) for brown eyes and a recessive allele (b) for blue eyes. What would the genotypic ratio of the offspring be?

• 50% BB, 50% Bb

• 25% BB, 50% Bb, 25% bb

• 50% Bb, 50% bb

• 100% Bb

Tags

NGSS.HS-LS3-3

Identify the following genotypes as homozygous or heterozygous.

TT: _____

Tt: _____

tt: _____

• TT: homozygous

  Tt: homozygous

  tt: heterozygous

• TT: homozygous

  Tt: heterozygous

  tt: heterozygous

• TT: homozygous

  Tt: heterozygous

  tt: homozygous

• TT: heterozygous

  Tt: heterozygous

  tt: homozygous

Tags

NGSS.HS-LS3-1

If square is dominant over round, what are the phenotypes for the following genotypes?

SS: ______

Ss: ______

ss: ______

• SS: round

  Ss: round

  ss: square

• SS: round

  Ss: square

  ss: round

• SS: square

  Ss: round

  ss: square

• SS: square

  Ss: square

  ss: round

Tags

NGSS.HS-LS3-2

The American Curl is a breed of cat that has curly ears. The allele for the curly ears is dominant (E). Suppose a cat with the heterozygous genotype is bred to a female cat with the homozygous recessive genotype.

Which punnett square below shows the correct genotype cross with the correct possible offspring?

• A

• B

• C

• D

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2