BISC 103xg Lecture Notes - Lecture 6: Dihybrid Cross, Zygosity, Wild Type

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A locus is the specific location of a gene along a chromosome. Homologous chromosomes have alleles of the same gene at the same locus. What can turn a b into a b can be a snp, a single nucleotide polymorphism. If an individual homozygous, it has the same allele on both homologues. Using dihybrid cross, mendel developed the law of independent assortment. Each pair of alleles segregates independently of each other pair of alleles. If an individual has the dominant phenotype, breeding it with a homozygous recessive individual and looking at the offspring tells you its genotype. The rule of multiplication, the odds of two independent events both happening is the product of their probabilities. If the same event can happen in multiple ways, the odds of it happening is the sum of their probabilities. A pedigree is the family tree of any given allele. Recessive inheritance is when heterozygous parents carry a disease-causing allele.

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