Mendel - The characteristics studied by Mendel were due to...

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Mendel’s Results for 7 different crosses P 1 F 1 F 2 F 2 ratio smooth X wrinkled seeds all smooth 5474 smooth 1850 wrinkled 2.96:1 yellow X green seeds all yellow 6022 yellow 2001 green 3.01:1 axial X terminal flowers all axial 651 axial 207 terminal 3.14:1 red X white flowers all red 705 red 224 white 3.15:1 inflated X constricted pods all inflated 882 inflated 299 constricted 2.95:1 green X yellow pods all green 428 green 152 yellow 2.82:1 tall X dwarf plants all tall 787 tall 277 dwarf 2.84:1 Conclusions from Mendel's Crosses The F 1 generation showed only one character that was present in the P 1 . The other character reappeared in the F 2 (25%). The sex of the parent did not matter. The traits did not blend. Mendel concluded that the F 1 plants must contain 2 discrete factors, one for each character. The character that was seen in the F 1 is called dominant . The character not seen in the F 1 is called recessive . Letters Can Represent Genes
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Unformatted text preview: The characteristics studied by Mendel were due to single genes. On the pair of chromosomes diagrammed below, the letter "A" represents a gene for yellow seeds. The letter "a" on the homologous chromosome represents a gene for green seeds. By convention, upper case letters are used to represent dominant genes and lower case letters are used for recessive genes. Because individuals are diploid , two letters can be used to represent the genetic makeup of an individual. In the case of seed color, the following three gene combinations are possible: AA, Aa, and aa. Heterozygote (also called hybrid) refers to an individual that has two different forms of the gene. Example: Aa Homozygote refers to an individual that has two identical genes. Example: AA or aa A hybrid is a heterozygote. Example: Aa...
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Mendel - The characteristics studied by Mendel were due to...

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