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Rest of Inheritance Concepts

Rest of Inheritance Concepts. Honors Biology. This week…. Today – rest of inheritance terms; discuss karyotypes (turn in) and dihybrids Tuesday – Pedigree activity Wednesday – Review Thursday – Review Friday – Test – Mendel and Inheritance Next week – prepare for End of Course!!!.

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Rest of Inheritance Concepts

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  1. Rest of Inheritance Concepts Honors Biology

  2. This week… • Today – rest of inheritance terms; discuss karyotypes (turn in) and dihybrids • Tuesday – Pedigree activity • Wednesday – Review • Thursday – Review • Friday – Test – Mendel and Inheritance • Next week – prepare for End of Course!!!

  3. Incomplete Dominance • Heterozygous offspring show a “blending” of the parents phenotypes. • Example: red flower (RR) X white flower (rr) = pink flower (Rr)

  4. Codominance • Both alleles of the parents are expressed in the heterozygous offspring. • Example: Red cow (RR) X White cow (rr) = Red and white spotted cow (Rr)

  5. Multiple Alleles • Trait is determined by genes with 3 or more alleles • Example: blood types. Type O = ii; recessive. Type A = IAIA or IAi Type B = IBIB or IBi Type AB = IAIB. A and B are codominant

  6. Sex-linked Traits • Traits that are carried on the X or Y chromosomes. X-linked more common since has more room for genes. • If trait is recessive, male more likely to show it. • Examples: Hemophilia, colorblindness • XHXh XHXHXhXh XHY XhY

  7. Linked genes • Genes that tend to be inherited together, because they are located close to each other on the chromosome. • A result of crossing over.

  8. Nondisjunction • When chromosomes don’t separate properly during meiosis. • One gamete ends up with more chromosomes than others.

  9. Pedigrees • Shows how traits are inherited over generations. • Pedigree activity tomorrow.

  10. Polygenic Traits and Disorders • Traits or disorders that are a results of more than one gene. • Example of polygenic traits: skin color or eye color

  11. Common Genetic Disorders • Use your textbook to write down the main body parts that are affected by each disorder, and if it’s autosomal dominant, autosomal recessive, or sex-linked. • Autosomal means body cells, not sex cells.

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