Alternate forms of Inheritance: Polygenic, Epistasis, Codominance

All genes have one trait that is dominant over a recessive one.

• True

• False

Red flowers and white flowers are mated together and pink flowers are made.  What inheritance pattern is this? 

• codominance
• incomplete dominance
• law of segregation
• multiple alleles 

REVIEW: How many alleles (letters) does a child get from each parent for each trait? Hint: Sperm and egg cells are haploid.

• 1

• 2

• 3

• 4

Tags

NGSS.HS-LS3-1

REVIEW: What you see, or the physical appearance.

• Genotype

• Phenotype

• Homozygous

• Heterozygous

How many alleles (letters) does each person carry for a trait? Hint: We are diploid adults!

• 1

• 2

• 3

• 4

What does heterozygous mean?

• An organism that has the same genes for a trait (TT or tt)
• An organism that has different genes for a trait (Tt)
• When neither gene is fully dominant; offspring is a mixture of both
• the different forms of a trait (hair color--> brown, blonde, red

The expression of both alleles for a trait in a heterozygous individual illustrates

• codominance

• incomplete dominance

• polygenic inheritance

• pleiotropy

What is epistasis?

• Characterized where one set of genes covers a totally separate set of genes.
• One gene controls expression of another

The range of human skin colors is caused by a variety of genes, each of which has at least 2 alleles.  This is an example of:

• incomplete dominance
• codominance
• multiple alleles
• polygenic inheritance

Tags

NGSS.HS-LS3-2

The gene for albinism interferes with the expression of other pigment genes so that even an individual that inherits dark alleles will be white.

• pleiotropy
• epistasis
• sex linked
• multiple alleles