genetic notes
- mendel wanted to know if traits and genes were attached.
- mendel's experiment showed that traits are not connected, because the parent generation has different assortment of traits
- law of independent assortment: allele pairs for different traits separate independently of one another during gamete formation.
- monohybrid cross: single gene, and only 2 alleles (Bb)
- Dyhybrid cross: 2 genes, and 4 alleles (RrYy)
- each allele separates and creates 4 possible combinations: RY Ry ry rY
RY Ry rY ry
RY RRYY RRYy RrYY RrYy
Ry RRYy RRyy RrYy Rryy
rY RrYy RrYy rrYY rryy
ry RrYy Rryy rrYy rryy
QUESTIONS:
- The law of independent assortment is the law that states allele pairs for different traits separate independently of one another during gamete formation
- A monohybrid cross has only one gene and 2 alleles, while dihybrid has 2 genes and 4 alleles.
- SP sp Sp sP Sp SSPp Sspp Sspp SsPp sp SsPp sspp Sspp ssPp Sp SSPp Sspp SSpp SsPp sp SsPp sspp Sspp ssPp S- short legs s- long legs P- polydactyly p- not polydactyly /16 for both long legs and polydactyly: .375 or 37.5
- Usually, when both organisms are heterozygous for 2 traits the ratio would be about 3:1 for the F1 generation.