Distinguish between mendelian and non-mendelian inheritance using the phenotypic outcome of reciprocal crosses.
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During Mendel’s study of pea plants in the 1800’s, nothing was known about DNA, chromosomes, genes, or meiosis. Mendel’s conclusions were drawn from observation and modeling. The discovery of these features of the cell and the cell cycle both confirmed Mendel’s findings, and helped to explain some inconsistencies with Mendelian genetics. Some of those inconsistencies are described below:
Incomplete Dominance: Mendel observed that there was no blending of alleles in inheritance (e.g., lavender flowers resulting from a cross between purple and white flowers). However, some traits do blend together. Another way of saying this is that heterozygous organisms express phenotypes with characteristics of both the dominant and the recessive allele. Some flowers exhibit incomplete dominance.
Incomplete Dominance: Mendel observed that there was no blending of alleles in inheritance (e.g., lavender flowers resulting from a cross between purple and white flowers). However, some traits do blend together. Another way of saying this is that heterozygous organisms express phenotypes with characteristics of both the dominant and the recessive allele. Some flowers exhibit incomplete dominance.
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