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xxx 1111 3333 2222 4444 5555 1111 3333 2222 4444 5555 1111 3333 2222 4444 5555 1111 3333 2222 4444 5555 1111 3333 2222 4444 5555xxxxxx xxx xxx.

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Presentation on theme: "xxx 1111 3333 2222 4444 5555 1111 3333 2222 4444 5555 1111 3333 2222 4444 5555 1111 3333 2222 4444 5555 1111 3333 2222 4444 5555xxxxxx xxx xxx."— Presentation transcript:

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2 xxx xxxxxx xxx xxx

3 Question: TRUE or FALSE: A gamete has one-half the number of chromosomes of a regular body cell. Check Your Answer xxx for 1

4 Answer: True Back to the Game Board xxx for 1

5 Question: TRUE or FALSE: During meiosis, chromosome number is reduced through three rounds of cell division. xxx for 2 Check Your Answer

6 Answer: FALSE (two times) Back to the Game Board xxx for 2

7 Question: TRUE or FALSE: Mendel’s work on garden pea plants resulted in the discovery that genetic traits of parents always blend together in subsequent generations. xxx for 3 Check Your Answer

8 Answer: FALSE (he discovered traits were dominant or recessive) Back to the Game Board xxx for 3

9 Question: TRUE or FALSE: Gregor Mendel’s research supports the idea each organism carries a pair of alleles. xxx for 4 Check Your Answer

10 Answer: TRUE Back to the Game Board xxx for 4

11 Question: TRUE or FALSE: In humans, the ability to roll one’s tongue is a dominant trait. Therefore, a tongue roller can only have children who are also tongue rollers. xxx for 5 Check Your Answer

12 Answer: FALSE (the person may be heterozygous and could have a child who could NOT roll the tongue. Back to the Game Board xxx for 5

13 Question: TRUE or FALSE: Meiosis occurs during both sexual reproduction and asexual reproduction. xxx for 1 Check Your Answer

14 Answer: FALSE (sexual reproduction only) Back to the Game Board xxx for 1

15 Question: What fraction of this cross will be recessive for both traits? xxx for 2 Check Your Answer

16 Answer: 1/16 Back to the Game Board xxx for 2

17 Question: During which phase of meiosis do homologous pairs of chromosomes line up next to one another along the equator? xxx for 3 Check Your Answer

18 Answer: metaphase I Back to the Game Board xxx for 3

19 Question: A pure-bred tall (TT) pea plant is crossed with a pure-bred short (tt) pea plant, and all the offspring are tall. What is the most likely genotype of the offspring assuming a single-gene trait? xxx for 4 Check Your Answer

20 Answer: Tt (heterozygous) Back to the Game Board xxx for 4

21 Question: In mice, black is dominant to white color and color is determined by a single gene. Two black mice are crossed. They produce 2 black offspring and one white offspring. If the white offspring is crossed with one of its parents, what percent of the offspring are expected to be white? xxx for 5 Check Your Answer

22 Answer: 50% (both parents are Bb = heterozygous) Back to the Game Board xxx for 5

23 Question: Mendel crossed a true-breeding plant that produced green seeds with a true- breeding plant that produced yellow seeds to produce an F1 generation. The entire F1 generation produced yellow seeds. Then he crossed the F1 offspring with each other to produce the F2 generation. From the F2 generation, he counted 6022 yellow seeds. Which of these is the most likely estimate of the number of green seeds he collected from the F2 generation? xxx for 1 Check Your Answer

24 Answer: approx (F2 phenotype ratio is 3:1 so 6000 ÷ 3 = 2000) Back to the Game Board xxx for 1

25 Question: A heterozygous organism is best described as which of these? xxx for 2 Check Your Answer

26 Answer: hybirds Back to the Game Board xxx for 2

27 Question: In which situation are the phenotypes of F2 offspring expected to follow the ratio of 9:3:3:1. A.a monohybrid cross for 2 unlinked traits B.a monohybrid cross for 2 closely linked traits C.a dihybrid cross for 2 unlinked traits D.a dihybrid cross for 2 closely linked traits xxx for 3 Check Your Answer

28 Answer: C.a dihybrid cross for 2 unlinked traits Back to the Game Board xxx for 3

29 Question: If two heterozygous individuals are crossed, what percent of their offspring are also expected to be heterozygous? xxx for 4 Check Your Answer

30 Answer: 50% (the genotype ratio is 1:2:1) 1 AA = 25% 2 Aa = 50% 3 aa = 25% Back to the Game Board xxx for 4

31 Question: Suppose an animal is heterozygous AaBb, and the traits are not linked. When meiosis occurs, what is the total number of possible combinations of gametes that can be made for these traits? xxx for 5 Check Your Answer

32 Answer: 4 AB Ab aB ab Back to the Game Board xxx for 5

33 Question: The typical human body cell contains 46 chromosomes. How many chromosomes are found in a typical human sperm? xxx for 1 Check Your Answer

34 Answer: 23 (sperm = gamete so it is haploid = half the normal) Back to the Game Board xxx for 1

35 Question: What is the role of the spindle fibers? A. to join homologous chromosomes together B. to store nucleotides prior to DNA synthesis C. to initiate the formation of the nuclear membrane D. to move chromosomes in the cell xxx for 2 Check Your Answer

36 Answer: D. to move chromosomes in the cell Back to the Game Board xxx for 2

37 Question: In mink, brown fur color is dominant to silver-blue fur color. If a homozygous brown mink is mated with a silver-blue mink and 8 offspring are produced, how many would be expected to be silver-blue? xxx for 3 Check Your Answer

38 Answer: Zero (all the offspring would be heterozygous) Back to the Game Board xxx for 3

39 Question: In chickens, rose comb (R) is dominant to single comb (r). A homozygous rose-combed rooster is mated with a single-combed hen. All of the chicks in the F 1 generation were kept together as a group for several years. They were allowed to mate only within their own group. What is the expected phenotype of the F 2 chicks? xxx for 4 Check Your Answer

40 Answer: 75% rose comb and 25% single comb (3:1 phenotype ratio) Back to the Game Board xxx for 4

41 Question : A white mouse whose parents are both white produces only brown offspring when mated with a brown mouse. The white mouse is most probably ____. xxx for 5 Check Your Answer

42 Answer: homozygous recessive Back to the Game Board xxx for 5

43 Question: Gregor Mendel is best known for his research on _______________ plants. xxx for 1 Check Your Answer

44 Answer: pea Back to the Game Board xxx for 1

45 Question: Two genes are considered linked when they are located close to each other on the same ____________________. xxx for 2 Check Your Answer

46 Answer: chromosome Back to the Game Board xxx for 2

47 Question: A geneticist refers to the appearance of an individual as his or her ____________________, while the genetic makeup is called the genotype. xxx for 3 Check Your Answer

48 Answer: phenotype Back to the Game Board xxx for 3

49 Question: An individual with the genotype Aa is ____________________ for the trait. xxx for 4 Check Your Answer

50 Answer: heterozygous Back to the Game Board xxx for 4

51 Question: Which stage of meiosis is represented in the cell above? xxx for 5 Check Your Answer

52 Answer: metaphase II Back to the Game Board xxx for 5


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