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Gregor Mendel discovered that tall was dominant and short recessive in pea plants. When he crossed two plants that were both heterozygous tall (Tt) he found a 3:1 ratio of tall to short (75% tall, 25% short) in the offspring leading him to conclude that in a monohybrid cross, the offspring would show a 3:1 ratio of dominant to recessive phenotypes. A student in a biology lab wants to know if plant flower color is also determined by simple Mendelian genetics. First she crosses a true breeding white flowering plant with a true breeding red flowering plant and observes that the offspring all produce red flowers. She then crosses two of these red flowering plants and records the phenotypes of the offspring. Analyze her data below using Chi square to determine if her results are similar to Mendelâ??s 3:1 ratio. find out the Chi square, Critical Chi square value at P=0.05.

Red Offspring White Offspring
81 29

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