5C Review

The alleles must separate when gametes are formed

• Trait

• The Law of Segregation

• Allele

• Homozygous

Tags

NGSS.HS-LS3-2

Having two identical alleles for a given gene; homozygous dominant (RR), homozygous recessive (rr)

• Trait

• The Law of Segregation

• Allele

• Homozygous

Having two different alleles for a given gene.

• Heterozygous

• The Law of Independent Assortment

• Molecular genetics

• Cross

Tags

NGSS.HS-LS3-2

An organism's physical appearance, or visible traits.

• P1 generation

• Gene

• Genotype

• Phenotype

An organism's genetic makeup, or allele combinations.

• P1 generation

• Gene

• Genotype

• Phenotype

Tags

NGSS.HS-LS3-2

What are dominant traits?

• Traits that are expressed when an individual has no copies of the dominant allele.

• Traits that are expressed when an individual has at least one copy of the dominant allele.

• Traits that are expressed when an individual has at least one copy of the recessive allele.

• Traits that are expressed when an individual has two copies of the dominant allele.

What are recessive traits?

• Genetic traits that are only expressed when an individual has one copy of the recessive allele.

• Genetic traits that are always expressed regardless of the number of copies of the recessive allele.

• Genetic traits that are only expressed in males.

• Genetic traits that are only expressed when an individual has two copies of the recessive allele.

This is a cross between heterozygous tall pea plants. Tall (T) is dominant to short (t). What fraction of the offspring do you predict will be tall?

• 1/4

• 2/4

• 3/4

• 4/4

Tags

NGSS.HS-LS3-2

NGSS.HS-LS3-1

In the problem shown, what must be the genotype of the missing parent?

• BB

• Bb

• bb

Tags

NGSS.HS-LS3-1

Having freckles is a dominant trait in humans.  A girl has freckles, but her brother does not. What do we know for certain about the parents?

• both parents have at least one recessive allele

• both parents are heterozygous for freckles

• one of the parents does not have freckles

Tags

NGSS.HS-LS3-2

NGSS.HS-LS3-1