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Genetics Review Part 2

Genetics Review Part 2. If a characteristic is sex-linked, it occurs more frequently in _______. Males. What is a diagram that shows how a characteristic is passed through a family?. Pedigree. What are the X and Y chromosomes called?. Sex chromosomes.

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Genetics Review Part 2

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  1. Genetics ReviewPart 2

  2. If a characteristic is sex-linked, it occurs more frequently in _______. • Males

  3. What is a diagram that shows how a characteristic is passed through a family? • Pedigree

  4. What are the X and Y chromosomes called? • Sex chromosomes

  5. What is an individual that doesn’t express a given trait but can pass it to it’s offspring? • carrier

  6. Xb Y XB Xb Redgreen color blindness is a sex-linked recessive trait . In a family the father is color blind and the mother is a carrier. Show your work for this cross

  7. Redgreen color blindness is a sex-linked recessive trait . In a family the father is color blind and the mother is a carrier. What is the genotype for the father? XrY

  8. Redgreen color blindness is a sex-linked recessive trait . In a family the father is color blind and the mother is a carrier. Out of 4 children, how many girls would be expected to be color blind? 1

  9. Redgreen color blindness is a sex-linked recessive trait . In a family the father is color blind and the mother is a carrier. Out of 4 children, how many boys would be expected to be color blind? 1

  10. What gender determines the sex of an offspring? • Male

  11. What is the gender of this karyotype? Male

  12. What genetic condition does this person have? Down Syndrome

  13. What is the gender of this karyotype? Male

  14. Is this karyotype considered “normal”? No

  15. How many blood types are there? • A • B • AB • O

  16. What is true about the Y chromosome compared to the X? It is shorter than the X

  17. What causes an organism to receive too many or too few chromosomes? • nondisjunction

  18. Sex-linked genes refer to what chromosome? • X

  19. How many chromosomes does a person with Down Syndrome have? • 47

  20. A male can produce sperm that is either ___ or ___. • X Y

  21. If both parents carry the recessive allele what is the chance that their child will inherit the genetic autosomal condition? • 25%

  22. XB XB XB XB XB Xb XB XB XB XBXB XBXB XBXB XBXB XBXB XBXB Y Y Y XBY XBYB XBY XBY XbY XBY Which Punnett Square is worked out correctly?

  23. X X X X X X XX XX XX X X X XX XX XX Y Y Y XY XY XX XY XY XX Which Punnett Square is worked out correctly?

  24. _____________is a mutation where an organism has an extra chromosome. • Trisomy

  25. Males have the sex chromosomes… XY

  26. Based on the pedigree shown, what is the genotype of person II-7? Bb

  27. Based on the pedigree shown, how many Daughters do the original parents have? 1

  28. Why are there more male children with hemophilia than female children with hemophilia? Hemophilia is linked to the x chromosome, so males need only 1 recessive gene to get hemophilia while females need both recessive genes

  29. Sample pedigree - cystic fibrosis 1. What can we say about I-1 and I-2? 2. What is the inheritance? 3. What are the odds that III-5 is a carrier? 4. What is the relationship between I-1and III-4? 5. Which individuals are affected with cystic fibrosis?

  30. Which parent determines the gender of the child? Father

  31. On a separate sheet of paper • Draw a pedigree that represents Julie married to Jeff, with one daughter, Josephine. Josephine married Joseph and had Jason and Joe. Joe married Julia and had Shannon and fraternal twin boys, Mark and Alex. Mark married Alison and had Ray and Scarlet. Please label the pedigree with the names of the people. • The individuals in red are affected with an autosomal recessive disorder. Please indicate the genotypes of each person in this pedigree

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