Mendelian Genetics

Law of Dominance and Uniformity

Some alleles are dominant, others are recessive. If 2 homozygotes with different alleles breed, then the offspring will all be heterozygous with the phenotyoe of the dominant allele

Law of Segregation

During gamete formation the alleles of each gene separate into separate gametes

Law of Independent Assortment

Alleles are passed on separately of each other

Dominance

Codominance: where both the alleles of a heterozygote are fully expressed and traits are neither dominant nor recessive e.g, Cc

Incomplete Dominance: heterozygous phenotype is distinct from (and often an intermediate of) the two possible homozygous phenotypes

Pedigrees

Autosomal dominant: affected parents can produce affected offspring

Autosomal recessive: unaffected parents can produce affected offspring

X-linked dominant: affected fathers produce affected daughters

X-linked recessive: affected mothers produce affected sons