PSYC 1100 Lecture Notes - Lecture 3: Punnett Square, Dna Replication, Genetic Recombination
2 Feb 2017
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Although not recognized until the early part of the 20th century. Spent a lot of time with pea plants. Dichotomous traits: occur in one form or another. True breeding: offspring always have the same trait. Crossbred the white seed plants and the brown seed plants. 2nd crossbreed generation brown seeds, white seeds. Traits the offspring inherit (i. e. through genetic material) = genotype. Dominant trait: occurs most often (brown seeds) Recessive trait: occurs less frequent (white seeds) Alleles: two genes that control the same trait. One inherited from mom and one from dad. Homozygous: two of the same genes (e. g. two brown seed genes) Heterozygous: two different genes for a trait (e. g. a brown and a white) Each chromosome is made up of dna. Each strand of dna contains thousands of genes. 23 matched pairs in humans (46 total chromosomes) The two genes (alleles) for each trait are situated at the same location, one on each chromosome of the pair.
