BIO 118 Lec 13 mendel S.pptx

BIO 118 Lec 13 mendel S.pptx - Mendel and the Gene Chapter...

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Mendel and the Gene Chapter 14
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How did Mendel discover the “rules” of inheritance? Gregor Mendel -1865- monk who was also a member of an association interested in selective breeding. Mendel set out to differentiate between the two hypotheses of the time: 1. Blending inheritance- traits observed in mothers and fathers blend together to form intermediate traits in their offspring 2. Inheritance of acquired characters- parental traits are modified through use and then passed on to their offspring in the modified form
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How did Mendel discover the “rules” of inheritance? 1. Prediction- when black sheep and white sheep mate, the offspring should be gray. 2. Prediction- if giraffes extend their necks by straining to reach tall leaves, they will transmit their extended neck to their offspring.
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How did Mendel discover the “rules” of inheritance? Mendel chose the pea as his model organism-It was the first in genetics! Inexpensive, easy to grow, short generation time, produce large numbers of offspring Under normal conditions, peas self-fertilize. Mendel prevented this from happening by removing the male reproductive organ from the flower. Later he would brush pollen from specifically chosen males onto the female reproductive organs. This is called cross- controlled mating
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How did Mendel discover the “rules” of inheritance? Mendel studied different phenotypes-observable traits Mendel started with true-breeding lines-consists of individuals that always produce offspring that are identical to themselves when they are crossed with another individual from the same line. He first confirmed that the true-breeding lines were really true- breeding. This verification took 2 years!
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How did Mendel discover the “rules” of inheritance? Mendel first experimented with a single trait. Mendel crossed true-breeding wrinkled peas with true-breeding round peas. Parental generation- individuals used in the first cross F1 generation- the progeny of the parental cross F2 generation- the progeny of a cross between the F1
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How did Mendel discover the “rules” of inheritance? Mendel’s work did not support the blending-inheritance hypothesis.
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How did Mendel discover the “rules” of inheritance? Monohybrid cross-a cross between individuals who each carry a different allele for a single trait. Dominant-Round-will dictate phenotype Recessive-Wrinkled-masked by the dominant allele when both are present in the individual
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How did Mendel discover the “rules” of inheritance? Reciprocal cross- set of matings where mother’s phenotype in the initial cross if the father’s phenotype in the subsequent crosses and vise versa When Mendel performed reciprocal crosses he got the same results….so the genotype of each sex doesn’t matter.
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