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Lecture 24

BIOL 1020 Lecture 24: Lecture 24

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Biological Sciences
BIOL 1020
Joy Stacey

Lecture 24 Mendels Model Mendel developed a hypothesis to explain the 3:1 inheritance pattern he observed in F2 offspring Four related concepts make up this model These concepts can be related to what we now know about genes and chromosomes 1. Alternate versions of genes account for variation gene for flower color in pea plants exists in two versions, one for purple flowers and the other for white flowers, now called alleles Each gene resides at a specific locus on a specific chromosome Homologous pair of chromosomes different alleles but same locus 2. For each characteristic, an organism inherits two alleles, one from each parent Mendel made this deduction without knowing about role of chromosomes Alleles homologous pairs Two alleles at a locus on a chromosomes may be identical, as in the true breeding plants of Mendels P generation Alternatively, the two alleles at a locus may differ, as in the F1 hybrids The third concept is that is the two alleles at a locus differ, then one (the dominant allele) determines the appearance, and the other (the recessive allele) has no effect on appearance In the flowercolor example, the F1 plants had purple flowers because the allele for that trait is dominant The fourth concept, law of segregation, states that the two alleles for heritable character separate (segregate) during gamete formation and end up in different gametes (each gamete gets single copy of one allele) (deals with one trait) Egg or sperm get only one of the two alleles that are present in the somatic cells of an organism
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