1. Genetics Review Part 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 are chromosomes pairs1-22 called?
Autosomes

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

7. Show your work for this cross
Red green 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 XB Xb Y
XBXb
XBY
XbXb
XbY

8. XrY What is the genotype for the father?
Red green 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

9. Red green color blindness is a sex-linked recessive trait
Red green 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

10. Red green color blindness is a sex-linked recessive trait
Red green 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

11. What gender determines the sex of an offspring?
Male

12. What is the gender of this karyotype?
Male

13. What genetic condition does this person have?
Down Syndrome Trisomy 21

14. What is the gender of this karyotype?
Male

15. Is this karyotype considered “normal”?

16. How many blood types are there?AB O

17. How many alleles do you have for blood type?2

18. Blood types A and B are expressed equally; they are
codominant

19. If 2 people have AB blood, what is the probability they will have an offspring with AB
50%

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

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

22. Sex-linked genes refer to what chromosome?

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

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

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

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

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

29. _____________is a mutation where an organism has an extra chromosome.
Trisomy

30. Males have the sex chromosomes…XY

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

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

33. 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?

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

35. What is any characteristic passed from parent to offspring?
A Trait

36. How do we represent the allele for a recessive trait?
Lowercase letter

37. A section of a chromosome that codes for a trait is a
Gene

38. What is the likelihood that a particular event will occur?
Probability

39. What is the genetic makeup of an organism called?
Genotype

40. The branch of Biology that deals with heredity
Genetics

41. Passing of traits from parent to offspring
Heredity

42. An allele that expresses itself in a hybrid is a(n)_________.
Dominant allele

43. All of the possible results of a genetic cross can be shown by using what tool?
Punnett Square

44. What is the term for the physical appearance that an organism expresses?
Phenotype

45. 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