BSCI 222 Lecture Notes - Lecture 8: Noncoding Dna, Chromosome, Characteristic Class
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Gives each child some dna from both parents -> mixing dna and some traits. A population with more variation is more likely to survive changes in environment. Variation allows for only some people to be susceptible to what could kill a population. (ex. Sexual reproduction is the fusion of gametes. Cell division: copying dna, apportionment of dna- via chromosomes to daughter cells. Divide the cell so each cell gets one copy of each parental chromosome. Amount of dna in offspring: have 92 chromosomes) Gametes cannot have full 46 chromosomes (if they did babies would. Each egg and sperm get half of the parent cell dna. Eukaryotes carry two copies of their genome. Each eukaryotic species has a characteristic number of chromosomes. Instead of 46 distinct chromosomes, humans have 23 pairs: humans have 46 chromosomes, two copies of each chromosome. Humans have 23 pairs of homologous chromosomes: two copies of each gene.