Dihybrid Mendel Problem PDF

# Dihybrid Mendel Problem ## Dihybrid crossing * Is cross between 2 pairs of Alleles * "'di"= two-two pairs ### Dominant (H) * capital * Allele - Produces a dominant phenotype in individual who have one copy of the allele (Hh or HH) * described alternative form of a gene ### Recessive (h) * prod...

# Dihybrid Mendel Problem ## Dihybrid crossing * Is cross between 2 pairs of Alleles * "'di"= two-two pairs ### Dominant (H) * capital * Allele - Produces a dominant phenotype in individual who have one copy of the allele (Hh or HH) * described alternative form of a gene ### Recessive (h) * produces recessive allele * Alleles to produce phenotype (hh) - both parents need to have ## Monohybrid Cross * Is cross between 2 organism creating different variations * only 25% chance of getting **Blue eyes** gene ## Gametes-names for Sperm(M)/Eggs(F) ### Mendals Law of Segregation * Gametes only carry one allele (crctter) for a gene * When more than one gene is present all combinations must be included ### Mendel's Law of Independent Assortment * says alleles are not linked ## Dihybrid crosses * HhSs x hhss ### First parent * **F** HS-First * **O** Hs-Outside * **I** hs-Inside * **L** hs-Last ### Second parent * **F** hs-First * **O** hs-outside * **I** hs-Inside * **L** hs-Last ## First Parent | Second Parent | HS | Hs | hs | hs | |---|---|---|---|---| | hs | HhSs | Hhss | hhSs | hhss | | hs | HhSs | Hhss | hhSs | hhss | | hs | HhSs | Hhss | hhSs | hhss | | hs | HhSs | Hhss | hhss | hhss | ## Codominance * Is when 2 alleles are expressed equally and neither allele is dominant * both contribute to Phenotype * examples: * Spots * AB blood type * color of flower pedals ## Incomplete Dominance * When both alleles are partially expressed * Is creating 'mesh' of both | | R | r | |---|---|---| | F | RR | Rr | | F | Rr | rr | * examples: * Skin color * flower color