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Mendel Law Exceptions

Mendel Law Exceptions. Biology Standard 3a. # 1:Codominance. Codominance. A condition in which both alleles show up in the phenotype. Neither allele is recessive. Codominance: Piebald Black-Pastel Ball Python. 2) Incomplete Dominance. 2) Incomplete Dominance.

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Mendel Law Exceptions

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  1. Mendel Law Exceptions Biology Standard 3a

  2. # 1:Codominance

  3. Codominance • A condition in which both alleles show up in the phenotype. • Neither allele is recessive.

  4. Codominance: Piebald Black-Pastel Ball Python

  5. 2) Incomplete Dominance

  6. 2) Incomplete Dominance • Heterozygous offspring are in b/t the 2 homozygous phenotypes. Blending!

  7. 3) Polygenic Traits

  8. 3) Polygenic Traits • Traits that are controlled by 2 or more genes. • Ex: skin/eye color in humans controlled by > 4 genes. • Creates wide range of trait

  9. 4) Crossing Over

  10. 4) Crossing Over • Pieces of gene on homologous chromosomes can get swapped during meiosis. • Creates new combos of alleles (differing mom/dad)

  11. Multiple Alleles • Some genes have more than 2 alleles. • Ex: Blood type: A, B, AB, O • But, you still will only get 2 copies of the allele, from mom and dad!

  12. Tie into Protein Synthesis • Traits that show up in phenotype came from DNA exon originally. • DNA  mRNA  protein (trait)

  13. Gene Linkage • Genes for traits can be inherited together  linked. • Each chromosome is actually a group of linked genes. • Ex: red eyes and mini wings on the fruit fly….found on same chromosome.

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