BIO 1130 Lecture Notes - Lecture 12: Disruptive Selection, Cladogenesis, Heterozygote Advantage
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Huxley he is the scientist along with others who put together the synthetic theory of evolution in the early 1900s. Allele: every organism has a pair of alleles on homologous chromosomes. The allele combination may create a phenotype that may not be unique to the genotype (dominant + recessive). Dominant and recessive: alleles can be dominant or recessive. The dominant one masks the recessive one in a heterozygote organism. Punnett squares - mendel: mendel bred a line of plants using inbreeding. This line of plants bred true for 1 allele. In other words, he created a small population of plants that was either homozygous dominant or homozygous recessive. If they were, you would get a 1:2:1 (homozygous. Dominant) : (heterozygous) : (homozygous recessive): the only explanation for these ratios is a pair of alleles, 1 dominant and 1 recessive, the reason mendel"s findings are called laws is that they are mathematical proofs about a phenomenon.