Name: HEREDITY TEST PRACTICE QUESTIONS. Core:

Transcription

1 Name: HEREDITY TEST PRACTICE QUESTIONS Core: 1. In pea plants, the allele for tallness (T) is dominant to the allele for shortness (t). In the cross between a tall pea plant and a short pea plant shown below, what is the probability that the resulting offspring will be tall? 50% B. 25% 75% T t t?? t?? 2. A rabbit is carrying a dominant allele for brown hair (B) and a recessive allele for white hair (b). What is the rabbit's phenotype? brown hair B. BB white hair Bb 3. Examine the pedigree below. 4. The pedigree below shows the inheritance of with sickle-cell According to the pedigree, how many daughters do the parents in generation I have? 2 B Albinism (a) is a recessive trait that causes the complete or partial absence of pigment in the skin, hair, and eyes. If two heterozygous rats (Aa) mate with each other, what is the probability that one of their offspring will be homozygous (AA) and not albino? A a A???? If night blindness is a recessive trait, what should the phenotype of the couple's fourth child be? The child will develop night blindness later in life. B. The child will be night blind. The child will have normal vision. The child could be night blind or have normal vision. a???? B. 0% 50%

2 6. If a woman has brown eyes with the recessive gene for blue eyes (Bb), each of her sex cells will have the gene for brown eyes (B). B. one gene or the other, B or b. the same genes she does (Bb). the gene for blue eyes (b). 7. In a certain breed of cats, having black hair is the result of two dominant alleles for hair color (HH). The heterozygous genotype (Hh) produces a cat that has black and white spots. Having two recessive (hh) genes results in a white-haired cat. The Punnett square below shows the results of a cross between which two cats? 9. The round pea seed trait is dominant over the wrinkled pea seed trait. If the phenotype of a pea seed is wrinkled, which combination of genes must it have? 10. two round genes B. two wrinkled genes one round gene only one wrinkled gene only H H H HH HH h Hh Hh a spotted cat and a white cat B. two spotted cats two black cats a black cat and a spotted cat 8. The pedigree below shows the inheritance of with sickle-cell The father in generation I has sickle-cell How many of his children have sickle-cell anemia? 4 B Look at the pedigree chart above. The squares are the male members of the family, and the circles are the female members of the family. Squares or circles that are all black are nearsighted members. Squares or circles that are all white have normal vision. Squares or circles that are part black are family members who carry the gene for nearsightedness but are not nearsighted. How many individuals in Generation II of the family have the gene for nearsightedness? 3 B Sickle-cell anemia is a genetic disorder of the blood in which the shape of red blood cells is distorted, resulting in a variety of health problems. The allele for normal blood cell production (H) is dominant to the allele for sickle cell production (h). If one parent has sickle-cell anemia and the other

3 parent is a carrier, what is the probability that their child will have sickle-cell anemia? Hint: Make a Punnett Square below to help you. 75% B. 50% 25% 100% 12. The pedigree below shows the inheritance of sickle-cell anemia in a particular family. The shaded symbols represent individuals with sickle-cell 13. In people, brown hair (B) is dominant over red hair (b). If a husband is Bb and his wife is bb, what is the probability that their first baby will have red hair? Hint: Make a Punnett Square below to help you. 75% B. 25% 50% 14. Examine the pedigree below. Sickle-cell anemia is a genetic disorder of the blood in which the shape of red blood cells is distorted, resulting in a variety of health problems. The gene copy for normal blood cell production (H) is dominant to the gene copy for sickle cell production (h). Which of the following is true about the parents highlighted in red? The father is homozygous dominant (HH) and the mother is homozygous recessive (hh). B. Each parent is heterozygous (Hh) for sicklecell Each parent is homozygous recessive (hh) for sickle-cell Each parent is homozygous dominant (HH) for sickle-cell If curly hair (C) is a dominant trait, what are the genotypes of the parents in the pedigree? One parent is heterozygous (Cc) for the curly hair trait, and the other parent is homozygous for the curly hair trait (CC). B. One parent is homozygous for the curly hair trait (CC), and the other parent is homozygous for non-curly hair (cc). Both parents are heterozygous (Cc) for the curly hair trait. Both parents are homozygous (CC) for the curly hair trait. 15. Having smooth seeds is a dominant trait. Having wrinkled seeds is a recessive trait. The offspring of two plants with wrinkled seeds will have wrinkled seeds. B. either, but wrinkled are more likely. round seeds. either, but round are more likely.

4 6. The pedigree below shows the inheritance of with sickle-cell probability that this individual would have inherited the disease? B. 100% 50% 75% According to the pedigree, how many grandchildren do the parents in generation I have? 1 B The pedigree below shows the inheritance of family. The shaded squares represent males with sickle-cell The shaded circles represent females with sickle-cell 17. What is determined by genes? the learned traits of an organism B. the inherited traits of an organism acquired characteristics the lifestyle of an organism 18. The pedigree below shows the inheritance of sickle-cell anemia in a particular family. The shaded symbols represent individuals with sickle-cell Which of the following is true about the individual highlighted in red? This individual has a grandmother with sickle-cell B. This individual has sickle-cell This individual has a grandfather with sicklecell This individual has two parents with sicklecell 20. In humans, the allele for brown eyes (B) is dominant to the allele for blue eyes (b). What is the probability that two heterozygous brown-eyed parents will have a child with blue eyes? Sickle-cell anemia is a genetic disorder of the blood in which the shape of red blood cells is distorted, resulting in a variety of health problems. The gene copy for normal blood cell production (H) is dominant to the gene copy for sickle cell production (h). The individual highlighted in red in the pedigree chart inherited sickle-cell What was the B. 75% 0% 50% B b B?? b??

5 Answers 1. A 2. A 3. D 4. B 5. A 6. B 7. D 8. D 9. B 10. A 11. B 12. B 13. D 14. C 15. A 16. B 17. B 18. A 19. C 20. A