Textbook notes - Textbook My attempts at definitions...

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Textbook 1. My attempts at definitions o Heredity The transfer of genes from one generation to the next o Variation Differences between one generation to the next o Genetics The study of heredity and passing of genetic material from generation to generation o Genes Genetic material that are found on the chromosomes, hundreds to thousands on one o Gametes Sex cells in the body (haploid) o Sister chromatids Two identical chromatids attached by a centromere o Non sister chromatids Identical chromatids that are not part of one chromosome (not sister chromatids) o Homologous chromosomes (homologs) Two pairs of sister chromatids that carry the same genes (but not same alleles) o Chromosome set A collection of different chromosomes that carry the same basic genes of a species o Sexual reproduction Reproduction that involves two different parents to come together and each make up a portion of the offspring's genetic make up o Clone A product of asexual reproduction, identical copy of parent o Autosomes A non sex chromosome (44 of them in humans diploid cells) o Sex chromosomes Either an X or Y chromosome, determine sex of the offspring o Asexual reproduction Reproduction with only one parent, makes clones, and does not have variance in the species o Karyotype A layout of an animals genome. Shows all the homologous chromosomes lined up with each other o Haploid cell A cell with a single chromosome set (n) o Diploid cell A cell with two chromosome sets (2n) o Zygote A fertilised cell that contains genetic information from both parents (diploid in humans) o Degrees of dominance (refer to the heterozygous genotypes) Codominance When both traits are expressed Incomplete domianance When a blending of the traits takes place Complete dominance
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When only one trait is expressed o Most genes exist of more then two allelic forms o Evolution o Fossils o Paleontology o Strata o Catastrophism o Uniformitarianism o Hutton, Lamark, Darwin, lyell, Cuvier o Adaptation o Darwin 4 observations Members of a population often vary greatly in their traits Traits are inherited from parents to offspring All species are capable of producing more offspring then the environment can support Owing to lack of food or other recourses, many offspring do not survive 2 inferences Individuals who inherit certain traits give them a higher probability of sruviving and reproducing in a given environment and tend to leave more offspring then other individuals The unequal ability of individuals to survive and reproduce will lead to the
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This note was uploaded on 05/05/2009 for the course BIOL 1010 taught by Professor Anafi/quinlan during the Spring '08 term at York University.

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Textbook notes - Textbook My attempts at definitions...

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