Which is an example of an heterozygous allele? A. Tt B. tt C. TT D. NONE OF THE

Question

Which is an example of an heterozygous allele? A. Tt B. tt C. TT D. NONE OF THE ABOVE Meiosis produces which of the following? A. plant cells B. animal cells C. sex cells D. skin cells Somatic cells reproduce by _______, while sex cells reproduce by _____. a. Mitosis: meiosis b. Mitosis: Mitosis b. Meiosis: Mitosis d. Meiosis: Meiosis Human gametes normally have _______ chromosomes. a) 23 b) 46 c) a diploid number of Which of the following statements about human reproduction is true? a) Mitosis in males is also known as spermatogenesis. b) Sperm and ova are zygotes. c) Oogenesis takes place in the ovaries of females. Which of the following statements is true about mitosis in humans? a) All cells of the body go through mitosis more or less constantly from conception until death. b) Each cell undergoing mitosis divides into two complete new cells that are usually identical to the cell from which they originated. c) It takes roughly two weeks for a cell to go through all six phases of mitosis.

Explanation / Answer

9) Heterozygous allele means, a combination which has two different alleles. B has ttt, where both are recessive and in C both are dominant i.e. TT. So the answer is A, because it has one dominant and one recessive allele, T and t.

10) cell division is of two types mitosis and meiosis. In mitosis, cells maintain the same chromosome number after doubling. This is necessary to maintain functions and mitosis is quite common among all cells. In meiosis chromosome number will be reduced to half. So this is important for generating gametes, which are necessary for reproduction. So the answer is C, sex cells.

11) As explained above, somatic cells means all of the bodies cells. They will be reproduce by mitosis and sex cells reproduce by meiosis. So the answer is A.

12) Normal human cell will have 46 chromosomes and this number will be reduced to half during gamete formation through meiosis. So the answer is A i.e. 23

13) Correct answer is C, oogenesis takes place in the ovaries of females

14) The answer is B. Sex cells go through meiosis, so A can be ruled out. For mitosis to finish around 6 hrs is enough, not 6 weeks, so c also was ruled out.

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