Genetics Review

1. Genetics Review

2. Which of the below represents a trait? • Eye color • Type A blood • Rr

3. Which of the below represents a trait? • Eye color • Type A blood • Rr

4. An allele that expresses itself in a heterozygous individual is a • dominant allele • dihybrid • pedigree • recessive allele

5. An allele that expresses itself in a heterozygous individual is a • dominant allele • dihybrid • pedigree • recessive allele

6. Which of the below represents a genotype? • Eye color • Type A blood • Rr

7. Which of the below represents a genotype? • Eye color • Type A blood • Rr

8. Different versions of a gene are known as ____. • Traits • Phenotypes • Genotypes • Alleles

9. Different versions of a gene are known as ____. • Traits • Phenotypes • Genotypes • Alleles

10. An organism with two different alleles for a single gene is • Homozygous • Heterozygous • Phenotypic • Genotypic

11. An organism with two different alleles for a single gene is • Homozygous • Heterozygous • Phenotypic • Genotypic

12. An organism with the genotype RR is called • Homozygous recessive • Heterozygous • Homozygous dominant

13. An organism with the genotype RR is called • Homozygous recessive • Heterozygous • Homozygous dominant

14. The appearance of an organism is its • Genotype • Phenotype • Genotypic ratio • Karyotype

15. The appearance of an organism is its • Genotype • Phenotype • Genotypic ratio • Karyotype

16. Which of the following genotypes is heterozygous? • RR • Rr • rr

17. Which of the following genotypes is heterozygous? • RR • Rr • rr

18. Which of the below represents a phenotype? • Eye color • Blonde hair • Rr

19. Which of the below represents a phenotype? • Eye color • Blonde hair • Rr

20. Which of the following genotypes is homozygous recessive? • RR • Rr • rr

21. Which of the following genotypes is homozygous recessive? • RR • Rr • rr

22. A cross that is written RrGg x RrGgis an example of a • Monohybrid cross • Dihybrid cross • Pedigree • Co-dominance

23. A cross that is written RrGg x RrGgis an example of a • Monohybrid cross • Dihybrid cross • Pedigree • Co-dominance

24. In the cross that is written RrGg x RrGgwhat are the four possible genotypes for gametes produced by the first parent?

25. In the cross that is written RrGg x RrGgwhat are the four possible genotypes for gametes produced by the first parent? RG, Rg, rG, rg

26. A monohybrid cross of two individuals that are heterozygous for a trait exhibiting simple dominance would produce a phenotypic ratio of • 4 dominant: 0 recessive • 3 dominant: 1 recessive • 1 dominant: 3 recessive • 1 dominant: 1 recessive

27. A monohybrid cross of two individuals that are heterozygous for a trait exhibiting simple dominance would produce a phenotypic ratio of • 4 dominant: 0 recessive • 3 dominant: 1 recessive • 1 dominant: 3 recessive • 1 dominant: 1 recessive

28. In a dihybrid cross between an individual with the genotype RRYY and an individual with the genotype rryy, all of the offspring will have the genotype • RRYY • RrYY • RrYy • rryy

29. In a dihybrid cross between an individual with the genotype RRYY and an individual with the genotype rryy, all of the offspring will have the genotype • RRYY • RrYY • RrYy • rryy

30. In pea plants, tall plants are dominant to short plants. If two heterozygous tall plants are crossed, what percent of the offspring will be short? • 25% • 50% • 75% • 100%

31. In pea plants, tall plants are dominant to short plants. If two heterozygous tall plants are crossed, what percent of the offspring will be short? • 25% • 50% • 75% • 100%

32. Albino individuals lack all pigmentation so that their hair and skin are white. This family tree shows that albinism a. is carried only by females in this family b. is a recessive trait c. is a sex-linked gene d. requires both parents to be albinos

33. Albino individuals lack all pigmentation so that their hair and skin are white. This family tree shows that albinism a. is carried only by females in this family b. is a recessive trait c. is a sex-linked gene d. requires both parents to be albinos

34. Two spotted leopards produce a litter of four cubs. Three of the cubs are spotted and one is solid black. The black coat is probably what type of trait? • Dominant • Recessive • Co-dominant • Sex-linked

35. Two spotted leopards produce a litter of four cubs. Three of the cubs are spotted and one is solid black. The black coat is probably what type of trait? • Dominant • Recessive • Co-dominant • Sex-linked

36. If a cross is made between a pure-breeding green, round (yyRR) plant and a pure-breeding yellow, wrinkled (YYrr) plant, what is the result? Use a DihybridPunnett square to help you!!! • all green, wrinkled peas • all yellow, round peas • all yellow, wrinkled peas • none of the above

37. If a cross is made between a pure-breeding green round (yyRR) plant and a pure-breeding yellow wrinkled (YYrr) plant, what is the result? Use a DihybridPunnett square to help you!!! • all green, wrinkled peas • all yellow, round peas • all yellow, wrinkled peas • none of the above

38. According to the pedigree below, the trait being studied earlobes is ________ . • Dominant • Recessive • Could be either dominant or recessive

39. According to the pedigree below, the trait being studied earlobes is ________ . • Dominant • Recessive • Could be either dominant or recessive

40. What is the sex of this organism?

41. FEMALE • What is the sex of this organism?

42. What is the sex of this organism?

43. MALE • What is the sex of this organism?

44. What disorder does this person have and what event caused it?

45. This person has Down Syndrome, also known as Trisomy 21, as result of non-disjunction of homologous chromosomesduring meiosis • What disorder does this person have and what event caused it?