Unit 7 - Genetics

What is an allele?

• a chromosome from mom and from dad

• a different form of a gene for the same trait

• a change in a base pair of the DNA

• when a trait is passed on by the mother

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

An allele that is always expressed whenever it is present is called ________.

• phenotype

• genotype

• dominant

• recessive

The ____________ of an organism is the physical appearance or variation of a trait that is expressed in an individual.

• genotype

• phenotype

• allele

• cross

Tags

NGSS.HS-LS3-3

A genotype in which the two alleles are different is called? An example of this genotype would be would (Aa or AB) .

• heterozygous

• homozygous

• genotype

• phenotype

A form of dominance in which the alleles of a gene pair in a heterozygote are BOTH fully expressed, resulting in offspring with a phenotype that is neither dominant nor recessive is called_____________?

• complete dominance

• recessive alleles

• sex-linked

• codominance/incomplete

Tags

NGSS.HS-LS3-2

A trait associated with a gene that is carried only by the male or female parent is called a _____________________ trait.

• codominance

• multiple alleles

• polygenic

• sex-linked

Tags

NGSS.HS-LS3-1

When there are more than 2 different versions (alleles) for the same trait. For example, for blood types there are 3 alleles - A, B, and O.

• polygenic

• multi-allele

• sex-linked

• complete dominance

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

In mice, the black fur allele is dominant to the white fur allele. Which of the genotypes below would code for a mouse with white fur?

• BB

• Bb

• bb

• white can never be shown

Tags

NGSS.HS-LS3-1

In mice, the black fur allele is dominant to the white fur allele. What is the % chance that a heterozygous dad and recessive mom have a white furred offspring?

• 0%

• 25%

• 50%

• 75%

• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

In peas, the purple flower allele is dominant to the white flower allele. What is the % chance that the offspring is purple if 2 heterozygous parents cross?

• 0

• 25

• 50

• 75

• 100

Tags

NGSS.HS-LS3-3