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Alternative Types of Inheritance. Dominant/Recessive. Inheritance where there are 2 alleles one of which prevails over the other No mixing No in between Ear lobes- recessive means attached ear lobes, if have dominant gene show detached ear lobes. -Detached ear lobes - Genotype: Ee or EE.

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dominant recessive
Dominant/Recessive
  • Inheritance where there are 2 alleles one of which prevails over the other
    • No mixing
    • No in between
  • Ear lobes- recessive means attached ear lobes, if have dominant gene show detached ear lobes

-Detached ear lobes

- Genotype: Ee or EE

-Attached ear lobe

- Genotype: ee

incomplete dominance
Incomplete Dominance
  • Phenotype of a heterozygous individual is intermediate between those of two homozygous individuals
  • Ex. Snap Dragon Plant

White snap dragon plant

Genotype: rr

Red snap dragon plant

Genotype: RR

Pink snap dragon plant

Genotype: Rr

codominance
Codominance
  • In heterozygotes the phenotypes of both homozygotes is expressed
  • AKA both alleles are expressed equally
  • Ex. Human Blood Types

Type A blood

Genotype: IAi

Type B blood

Genotype: IBi

Type AB blood

Genotype: IBIA

Type O blood

Genotype: ii

multiple alleles
Multiple Alleles
  • More than 2 alleles exist for a certain trait
  • Ex Blood Typing
    • 3 alleles to determine blood type
polygenic inheritance
Polygenic Inheritance
  • When a trait is controlled by 2 or more genes
  • Ex. Height
    • Controlled by several genes, explains why there’s a range of heights
    • Environmental factors also play a role
up till now
Up till now…
  • All of the patterns of inheritance could be explained as long as one understands the patterns of inheritance for the trait in question
  • BUT there are some inheritance patterns that Mendel’s laws can’t explain
sex linked
Sex Linked
  • Traits controlled by genes located on the sex chromosomes (AKA autosomes)
  • Ex. Color Blindness
    • Recessive allele located on the X chromosome

C

O

L

O

R

B

L

I

N

D

This is what a red/green color blind person would see.

N

O

R

M

A

L

Female genotype: XBXB or XBXb

Male genotype: XBY

Female genotype: XbXb

Male genotype: XbY