Multiple Alleles

Beyond Mendelian Genetics

Multiple Alleles

-Codominance

-Incomplete Dominance

Multiple Select

Which are Mendel's laws of inheritance?

• a pair of alleles(genes):one from dad and one from mom

• multiple genes for a trait inherited from both parents

• one trait is dominant over the other

Multiple Choice

Mendel's law of dominance means

• genes from parents are dominant in the offspring

• one allele of a gene is dominant over the other

• two genes are both showing up in the offspring

• blending of traits results in a new phenotype

Multiples Alleles

• 3 or more alleles to choose from

• each trait only contains 2 alleles

• one allele from dad

• one allele from mom

Multiple Choice

Multiple alleles for a trait means

• multiple parents

• multiple offspring produced

• 3 or more sources of genes

Multiple Choice

Even there are several different sources of alleles, each trait ONLY contains

• 3 or more alleles from the top of family tree

• 2 alleles, one from mom and one from dad

• one allele, from the gene of the dominant parent

Multiple Alleles

• codominant- both traits are showing up a new phenotype

• incomplete dominance-mix of traits or a blend of traits as a new phenotype

Beyond Mendel Genetics

Incomplete Dominance=red flower x white flower= pink flower

(RR x WW=RW)

Codominance-both color traits showed up

BB x WW=BW (white cow with a brown spot

Codominance

• both colors showed up in the roan cattle offspring

• BB x WW=BW

• In blood types: AA x BB=AB

• Ao x Bo= AB

Incomplete Dominance

• offspring flowers are neither red nor while

• a mix of red and white which is pink

• RR x WW = RW

Multiple Select

Which cross or crosses are Mendel genetics?

• BB x Bb=BB, Bb

• TT x tt= TT, Tt, tt

• RR x WW=RW

Multiple Choice

Both traits are showing up in the offspring phenotypes

• codominance

• dominant traits

• incomplete dominance

• Mendel genetcs

Multiple Choice

blood type AA x blood type BB= type AB in offspring blood type

• codominance

• incomplete dominance

• dominant and recessive genes

Multiple Choice

Black fur x white fur= gray fur in the offspring of rabbits, BB x WW =BW

• codominance

• dominant genes

• incomplete dominance

• Mendel genetics

Multiple Choice

blending of traits as phenotypes in an offspring

• codiminance

• incomplete dominance

• Mendel Genetics

Interpreting Punnett Square

• both parents are heterozygous, Bb x Bb

• if B-represent a brown eye allele, brown eyes is dominant

• offspring: BB(brown eyes); Bb(brown eyes); bb(blue eyes-the only recessive)