Biology 1 Notes 3/21
Biology 1 Notes 3/21 BIOL 11900
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This 1 page Class Notes was uploaded by jsmith22 on Sunday April 3, 2016. The Class Notes belongs to BIOL 11900 at Ithaca College taught by Professor Rebecca Brady in Spring 2016. Since its upload, it has received 27 views. For similar materials see Fundamentals of Biology I: Cells and Bodies in Biology at Ithaca College.
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Date Created: 04/03/16
● Classical Genetics ○ Genes and environment influence each other ○ What is a gene? ■ Stretch of DNA that codes for a single peptide chain ■ Comes in different versions or alleles ■ Everyone has the same genes, only different versions ○ Some traits are controlled by a single locus (gene) ■ Phenotype what you look like ■ Genotype what alleles you have ● Written as 2 letters ■ Dominant alleles mask the phenotype of recessive alleles ● Only need one copy of dominant alleles to control phenotype ○ Mendelian Genetics ■ Truebreeding, another word for homozygous ■ Cross breed, mixing two homozygous ● Results in heterozygous pair ■ Alleles segregate randomly among offspring ● Equal chance of each parent passing on each allele ■ When loci are on different chromosomes, they will separate independently ● Law of Independent Assortment ■ If alleles segregate randomly, we can predict outcomes using probability ● And multiply ● Or add ■ Individuals expressing the dominant phenotype have ambiguous genotypes ■ A testcross allows you to determine genotype of the parents by looking at the phenotype of the offspring ○ Sex Stuff ■ X and Y chromosomes determine phenotypic sex in humans ● Autosomes nonsex chromosomes ● Sex Chromosomes contains genes that cause sexual differentiation ● X chromosome also contains non sex related genes ● Sexlinked genes genes are on the X chromosome, so inheritance is linked to sex
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