Patterns of Inheritance - Complete,Incomplete & Co-Dominance

Hitchhiker’s thumb (able to bend the thumb backward from strait) is a trait that is controlled by dominant and recessive alleles. A straight thumb (S) is dominant to the “hitchhiker thumb” (s) trait. If one parent is has hitchhiker’s thumb and the other is heterozygous what percentage of their offspring could have a straight thumb?

• 25%

• 50%

• 75%

• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

Hitchhiker’s thumb (able to bend the thumb backward from strait) is a trait that is controlled by dominant and recessive alleles. A straight thumb (S) is dominant to the “hitchhiker thumb” (s) trait. If one parent is has hitchhiker’s thumb and the other is heterozygous what percentage of their offspring could have hitchhiker's thumb?

• 0%

• 25%

• 50%

• 75%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

Japanese four o’clock flowers can be red, white or pink (an intermediate shade). Which pattern of inheritance best describes this color scheme?

• Complete dominance

• Co-dominance

• Recessive inheritance

• Incomplete dominance

If two pink flowers from question 2 were crossed, what percentage of the offspring could be pink? red? white?

• 100% pink

• 50% pink; 25% red; 25% white

• 50% red; 50% white

• 33% pink; 33% red; 33% white

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

Consider the flowers from question 4. If a pink flower and white flower were crossed, what percentage of their offspring could be red?

• 0%

• 25%

• 33%

• 50%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Human blood types are controlled by multiple alleles. The AB blood type is formed by A and B alleles that are codominant with one another. Type A blood and type B blood are both dominant to type O.

What genotype(s) can result in type A blood?

• AA only

• AA or AB

• AB or Ao

• AA or Ao

Tags

NGSS.HS-LS3-2

Hair texture follows a pattern of incomplete dominance. A cross between curly hair (CC) and straight hair (SS) produce the intermediate wavy hair (CS). If one parent has wavy hair and the other has straight hair, what percentage of their offspring will have curly hair?

• 0%

• 25%

• 50%

• 75%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Albinism is a recessive genetic condition in which pigmentation (generally from melanin) is lacking. An individual with true albinism will have white hair (eyelashes & eyebrows included), very pale skin and red eyes. If each parent is heterozygous, what percentage of their offspring could be affected by albinism?

• 0%

• 25%

• 50%

• 75%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

Magnolia trees are my favorite. The three magnolias around my house are starting to bloom, with flowers that are dark pink around the center and white around the outer edges. Which pattern of inheritance best describes this color scheme?

• Complete dominance

• Incomplete dominance

• Co-dominance

• Recessive inheritance

If “P” represents a dark pink allele and “W” represents a white allele, what might the genotype of the magnolia flowers described in question #9?

• WW

• PP

• PW

• RR

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2