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Genetics II - BIOS 1063 Patterns of Inheritance I Gregor...

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BIOS 1063 Patterns of Inheritance I Gregor Mendel - (Austrian Monk) 1860’s In the 1900s—he was recognized as the Father of Genetics He used Pea plant genetics and looked at Flower color, seed coats etc. Purple flowers crossed with white flowers: Mendel expected pink flowers. Instead he found 3 purple flowers and 1 white flower out of 4 plants Alternate forms of a gene are called alleles. We always have 2 alleles because we are diploid organisms. You have 23 pairs of chromosomes. Each pair of chromosomes codes for the same genes, for example, hair color, and blood type, are coded on the same chromosome pair. This does not mean they are identical. For instance the gene for hair color, may code for blonde hair or brown hair. These are alleles. Humans have 46 chromosomes-23 homologous chromosomes Homologous 1 set mom (egg) 1 set from dad (sperm) Genes code for certain characteristics. Many genes are on every chromosome. Alleles are two types (alternate forms) of the same gene (blue eyes or brown eyes) Gene locus is the location of the gene on the chromosomes Alleles are denoted by letters of the alphabet. Some alleles are dominant over the other alleles-for instance you may have heard that brown eyes are dominant over blue eyes.
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