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A 29-30 87-90 B 26-28 78-84 C 21-25 63-75 D 18-20 54-60 F 0-17 0-51

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A 29-30 87-90 B 26-28 78-84 C 21-25 63-75 D 18-20 54-60 F 0-17 0-51

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  1. Take Practice Test: On a separate sheet of paper write down numbers 1-30. 1. 2. 3. through 30. Indicate which ones you got correct with + or - . Use the grade breakdown to check your score.

  2. This is the Benchmark Grade Breakdown Grade # Correct Points Earned A 29-30 87-90 B 26-28 78-84 C 21-25 63-75 D 18-20 54-60 F 0-17 0-51

  3. 5A DNA Structure & Replication

  4. 1. (5A)The weakest bonds in a double-stranded molecule of deoxyribonucleic acid exist between the • Deoxyribose sugars • Phosphate groups • Nitrogenous bases • 5-carbon sugars

  5. 2.(5A) The following nucleic acid portion labeledX could be • Adenine • Ribose • Deoxyribose • Phosphate X

  6. 3. (5A) DNA is a polymer consisting of units called? • Dipeptides • Amino Acids • Carbohydrates • Nucleotides

  7. 4. (5A) A DNA nucleotide may contain? • Deoxyribose, uracil & a phosphate group • Ribose, uracil & a phosphate group • Deoxyribose, thymine & a phosphate group

  8. 2A & 2B Meiosis

  9. 5. (2A) If an organism’s diploid number is 28, its haploid or monoploid number is • 52 • B. 26 • C. 14 • D. 7.5

  10. 6. (2B) In human males, the production of a haploid or monoploid cell by spermato-genesis occurs in the • penis • B. testes • C. vagina • D. ovaries

  11. 7. (2A) A horse has 64 chromosomes. Each gamete of this organism contains 32 of this process? • germination • B. meiosis • C. Binary fusion • D. hypergermination

  12. 8. (2B) In human males, the process of meiotic cell division usually forms • one diploid cell • B. Four diploid cells • C. Four monoploid cells • D. One monoploid cell

  13. 9. Haploid or monoploid cells have half the number of chromosomes as diploid cells. Which of the following is true about haploid cells? • They undergo meiosis • B. They undergo mitosis C. They are the result of mitosis • D. They are the result of meiosis

  14. 10. (2B) What does the diagram below represent? • Asexual reproduction • B. Vegetative propagation • C. Mitosis • D. Meiosis

  15. 2C & 3B Segregation & Independent Assortment

  16. 11. 2C A pea plant carries a gene for wrinkled seed coat and a gene for smooth seed coat. Smooth seed coat is dominant over wrinkled. The gene or genes the plant will probably pass on is determined by ___? A.Both genes being present in the gamete. B. Dominant genes being more likely to be passed on. C. Recessive chromosomes being more likely to be passed on. D. Random segregation of chromosomes.

  17. 12. 2C A pea plant has heterogeneous genes for height. According to Mendel’s Law of Segregation, which example correctly shows the gamete formation in the plant? Dd Dd A B Dd dd Dd Dd Dd Dd C D Dd D d

  18. 13. In a certain species of lizards, brown color is Dominant (B) over the green recessive (g) trait. If a homozygous Brown lizard is crossed with a green lizard, the genotype the F1 generation will most likely be B B g A.75% Bg and 25% gg B.25% BB, 50% Bg and 25% gg g C.100% Bg. D.50% BB and 50% gg

  19. P generation cross F1 generation Cross F1 generation Cross 14. 2C In the P generation, a tall plant is crossed with a short plant. The probability that the F2 plant will be tall is A.50% B.75% C.25% D.100%

  20. 15. 2C In the P generation, a tall plant is crossed with a short plant. If the alleles did not segregate during formation A.All of the the F1 plants would be short. B.Some of the F1 would be tall and some would be short. C.All of the F2 would be short. D. All of the F2 would be tall.

  21. 16. (3B) A man and a women that are both heterozygous for normal skin pigmentation (Aa) produce an albino offspring(aa). Which of Mendel’s Law explains the reason why? A. Segregation & Dominance B. Segregation Only C. Dominance Only D. Independent Assortment

  22. 17. 2C When Gregor Mendel crossed true-breeding tall plants with true-breeding short plants, all the offspring were tall because A. The allele for tall plants is recessive B. The allele for short plants is dominant. C. The allele for tall plants is dominant

  23. 2D & 2E Segregation & Independent Assortment

  24. 18. 2D In humans, a male has? • two X chromosomes. B. one X chromosome only • C. two Y chromosomes. • D. one X and one Y chromosome.

  25. 19. 2D A child will be a female if A. It receives a Y chromosomes from its mother B. It receives a X chromosomes from its father C. It receives a Y chromosome from its father D. None of the above

  26. 20. 2D A child will be a male if A. It receives a Y chromosomes from its mother B. It receives a X chromosomes from its father C. It receives a Y chromosome from its father D. None of the above

  27. 21. 2E Organisms that have two identical alleles for a particulartraitaresaid to be? A. Hybrid B. Heterozygous C. Homozygous Same = Identical Same = Homo Hetero = Different D. Dominant Hybrid = Different

  28. 22. 2D New combinations of alleles may be generated through the fusion of gametes during this process. • meiosis B. mitosis • C. spermatogenesis • D. fertilization

  29. 23. (2D) What are the expected offspring phenotypes of a cross between (RrYy) and (RRYy) parents? RRYY = 2 RRYy = 4 RrYy = 6 Rryy = 4 • 2 • 4 • 6 • 8

  30. 24. 2E Compared to the number of chromosomes contained in a body cell of a parent, how many chromosomes would normally be contained in a gamete? • The same number. B. Twice as many. • C.Half as many. • D. One-fourth as many

  31. 2F, 2G & 3A Segregation & Independent Assortment

  32. 25. In tulips, neither the red nor the white allele is dominant. If a tulip with one red allele and one white allele (RW) is bred with a tulip with the same alleles (RW), what color will thefirst generation be? R W • Both Red and White. RR RW R W B. Red only. • C. White only. RW WW • D. Red, White or Pink.

  33. 26. When Gregor Mendel crossed true-breeding tall plants with true-breeding short plants, all the offspring were tall because? • the allele for tall plants is recessive. B.the allele for short plants is dominant. • C.the allele for tall plants is dominant. • D.they were true-breeding like their parents. T T t Tt Tt t Tt Tt

  34. 27. In pigs, black skin (B) is dominant over white skin (b) and long hair (L) is dominant over short hair (l). A cross between two pigs hybrid for both traits (BbLl X BbLl) produces some offspring that have Black skin & long hair and some Black skin & short hair. The genotypes of these offspring illustrate the genetic concept of? • intermediate inheritance. B. Independent assortment. • C. Multiple alleles. • D. codominance.

  35. 28. Which diagram illustrates the fusion of normal gametes that will produce a human male? A. X + Y + Y Y B. X + X C. Y + X D.

  36. 29. What is the approximate probability that a human offspring will be female? A. 10% B. 25% C. 50% D. 100%

  37. 30. Which fur color will a rabbit with bb alleles have? Gene Traits B Brown Fur (Dominant) b Black Fur (Recessive) L Long Fur (Dominant) l Short Fur (Recessive) A. Brown B. Black C. Brown or black D. Brown and black

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