Biology 1001A Lecture Notes - Lecture 10: Enzyme, Allosome, Y Chromosome
26 Nov 2016
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Document Summary
Variation means differences in double stranded dna sequence. Origin is inherent in chemistry of dna, enzymology of replication/repair/recombination/cytoskeleton. Can be influenced by physical, chemical biological agents/conditions. Polygenic: traits that show continuous variation in a population. Meaning there isn t (cid:1005)(cid:1004)(cid:1004)% and (cid:1004)% of a trait. They are gradually distributed throughout the population. (bell shape curve when plotted) Mendel used careful experimentation with controlled crosses of species that were tested for discontinuous traits. Appearance of heterozygotes determined by the dominant trait. Some of the y chromosome is homologous to some of the x chromosome. Sex chromosomes have nothing to do with the sex parts within an individual. Males have uterus genes, but they are just not expressed in males. Sexually dimorphic: have different features based on their sex (female fruit flies are larger and have pointy bottoms) White eyes is a recessive gene of drosophila (w is white eyes.
