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Wake-up

Wake-up. How many chromosomes are in a human body cell? Explain a homologous pair. Multiple Alleles and Sex-Linkage. What are Multiple Alleles?. Three or more alleles for a particular gene. Example: Hair Color. Example: Eye Color. Example: Blood Types. Human Blood Type Allele #1.

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Wake-up

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  1. Wake-up • How many chromosomes are in a human body cell? • Explain a homologous pair.

  2. Multiple Alleles and Sex-Linkage

  3. What are Multiple Alleles? Three or more alleles for a particular gene

  4. Example: Hair Color

  5. Example: Eye Color

  6. Example: Blood Types

  7. Human Blood Type Allele #1 IA: Blood type A

  8. Human Blood Type Allele #2 IB: Blood type B

  9. Human Blood Type Allele #3 i: Blood type O

  10. Different Blood Types in Humans Blood Type A IAIA IAi

  11. Different Blood Types in Humans Blood Type B IBIB IBi

  12. Different Blood Types in Humans Blood Type AB IAIB

  13. Different Blood Types in Humans Blood Type O ii

  14. A man with blood type AB marries a woman whose genotype is O. Give the expected phenotypic and genotypic ratios for their children.

  15. A man with homozygous A blood marries a woman who is homozygous B. What are the chances that they will have a child with A blood? B blood?

  16. A man that is heterozygous for type B blood marries a woman who is heterozygous for type A blood. What blood types will their children have?

  17. A man is accused of fathering two children, one with type O blood and another with type A blood. The mother of the children has type B blood. The man has type AB blood. Could he be the father of both children? Explain.

  18. There are _________ chromosomes in a typical human body cell.

  19. There are _________ homologous pairs within these cells.

  20. What are Sex Chromosomes? Chromosomes that determine the sex of an organism

  21. Number of Sex Chromosomes in Humans

  22. Typical Female Sex Chromosomes

  23. Typical Male Sex Chromosomes

  24. What are Sex-linked Traits? Alleles that are attached to the sex chromosomes

  25. Tricky thing about the Y chromosome The Y chromosome does not hold any alleles

  26. Example of Sex-Linked Disorder: Color Blindness Inability to see colors in the normal way

  27. Colorblind TEST

  28. Affected GenotypesFemale: XbXbMale: XbYUnaffected GenotypesFemale: XBXB or XBXbMale: XBY

  29. Hemophilia Inability of the blood to clot properly

  30. Affected GenotypesFemale: XhXhMale: XhYUnaffected GenotypesFemale: XHXH or XHXhMale: XHY

  31. Cross a colorblind male with a carrier woman. What are the chance of them having a colorblind child?

  32. A woman who has hemophilia marries a normal male. They are worried about their children having hemophilia. Should they worry? Explain.

  33. If a man with normal color vision marries a color-blind woman, what is the probability of their having a color-blind son? A color-blind daughter?

  34. A woman with NO history of hemophilia in her family marries a color-blind male. They are worried about having an affected child. What are their chances?

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