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Incomplete Dominance and Meiosis Notes

Incomplete Dominance and Meiosis Notes. Sometimes one trait is not completely dominant over another Both alleles have a degree of influence. Incomplete Dominance. There is neither a dominant or recessive trait Both are expressed independently.

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Incomplete Dominance and Meiosis Notes

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  1. Incomplete Dominanceand Meiosis Notes

  2. Sometimes one trait is not completely dominant over another Both alleles have a degree of influence Incomplete Dominance

  3. There is neither a dominant or recessive trait Both are expressed independently Roan cattle are crossed from white and red cattle, resulting in red cattle with white blotches Codominance

  4. Interphase Prophase Metaphase Anaphase Telophase Cytokinesis Review Mitosis

  5. Mitosis is cell division to produce new cells New cells are identical to the original cell Meiosis is cell division to produce sex cells New cells are not identical to the original cell Mitosis vs. Meiosis

  6. Chromosomes are duplicated once, and the nucleus divides twice Prophase 1 Metaphase 1 Anaphase 1 Telophase 1 Prophase 2 Metaphase 2 Anaphase 2 Telophase 2 Meiosis

  7. Sex Cells • An egg or sperm cell • A sex cell carries half the number of chromosomes found in other body cells

  8. Sex Chromosomes • The chromosomes that carry genes that determine the sex of offspring • Eggs contain only the X chromosome • Sperm contain an X or Y chromosome

  9. Cells vs. Chromosomes • Sex cells are eggs or sperm that contain ½ the number of chromosomes, including one sex chromosome • Sex chromosomes contain genes that determine the gender of offspring

  10. Male sex chromosomes are XY Female sex chromosomes are XX 50:50 Chance

  11. Sexual Reproduction • Parent cells are known as sex cells or gametes • Two parent cells join together to form a new individual • Gametes have half the number of chromosomes in your body cells

  12. Less is More • Why is it important that sex cells have ½ the number of chromosomes? • Ensure the newly formed offspring have the correct number of chromosomes (46)

  13. Walter Sutton • Graduate student studied sperm cells in grasshoppers • Noticed chromosomes were located in the nucleus • Sutton proposed that genes are located on chromosomes

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