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Nonmendelian Genetics. Test Monday 1/31. Vocab Check…. Chromosome: DNA that has been tightly wound together, individuals genetic code Gene: segment on a chromosome that code for a trait Allele : distinct form of a gene. Multiple Alleles.

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nonmendelian genetics

Nonmendelian Genetics

Test Monday 1/31

vocab check
Vocab Check…
  • Chromosome: DNA that has been tightly wound together, individuals genetic code
  • Gene: segment on a chromosome that code for a trait
  • Allele: distinct form of a gene
multiple alleles
Multiple Alleles
  • When three or more alleles are formed in a population. These genes have multiple alleles
  • EX: Blood Type– A, AB, B, O
blood types
Blood Types
  • O is recessive
  • A and B are both dominant (codominant)
blood types1
Blood Types

How common are the blood types?

Transfusions:

Safe Transfusions

Antigen on

Red Blood Cell

Phenotype

(Blood Type

Genotype

From

To

blood types2
Blood Types
  • Cross a female who is heterozygous with A blood and a male who is heterozygous with B blood
codominance
Codominance
  • When both alleles are expressed (seen) fully
  • Happens in the heterozygous (Bb, Hh)
  • EX: speckled chickens and Blood Type
codominance in chickens
Codominancein Chickens
  • In chickens:

BB=black

Bb=speckled (codominant)

bb=white

Work a punnett square crossing a black rooster with a white hen

codominance in chickens1
Codominance in Chickens
  • What are the genotypes from the cross?
  • What are the phenotypes from the cross?
  • Phenotype is not read as a dominant look! In codominant traits both alleles are expressed hence the speckled look
incomplete dominance
Incomplete Dominance
  • When two different alleles for the same trait COMBINE, but neither “wins” expression over the other
  • Shows a BLENDED look phenotype in the heterozygous (Bb, Hh)
incomplete dominance snapdragons
Incomplete Dominance—Snapdragons
  • Snapdragons inherit color by incomplete dominance

RR=red

rr=white

Rr= PINK (blended look)

Cross 2 heterozygous snapdragons

incomplete dominance snapdragons1
Incomplete dominance--Snapdragons
  • What are the genotypes from the cross?
  • What are the phenotypes from the cross?
  • Phenotype is not read as a dominant look! In incomplete dominant traits the allele is expressed as BLENDED
incomplete dominance rabbits
Incomplete Dominance—Rabbits
  • Alleles are BLENDED—black rabbit crossed with a white rabbit makes a gray rabbit

X

sex linked traits
Sex-Linked Traits
  • Traits which are carried on the X chromosome
  • More common in MALES
  • EX: colorblindness, hemophelias
sex linked traits colorblindness
Sex-Linked Traits--Colorblindness
  • Colorblindness is a recessive trait
sex linked traits colorblindness1
Sex-Linked Traits--Colorblindness
  • Cross a female carrier with a normal male
  • What are the genotypes and phenotypes?