d. It occurs before mitosis 41. During which stage of mitosis is the nuclear env
ID: 253746 • Letter: D
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d. It occurs before mitosis 41. During which stage of mitosis is the nuclear envelope broken into pices? a. Interphase b. Prophase c. Anaphase d. Metaphase e. Telophase 42. Which of following is the notation for Down syndrome? a. (45, XO) b. (47, XXY) ?. (47, XXX) d. (47, +18) e. (47, +21) 43. The purpose of cross-over during meiosis is that it allows a. More offspring to be produced b. More females to be produced More genetic variation among the offspring c. d. All of these 44. What is the procedure used to detect chromosomal abnormalities in humans? a. Ultrasound b. Fingerprinting c. MRI d. Karyotyping 45. The products of a meiosis are a. b. c. d. two genetically identical cells two cells containing twice as much DNA as the parent cell four cells containing half as much DNA as the parent cell four genetically identical cells 46. Which of the following chromosomes are the longest chromosomes in the karyotype of a person? a. b. c. d. Chromosome #1 Chromosome #22 X chromosome Y chromosome 47. Homologous chromosomes are genetically identical. a. True b. False 48. Which of the following processes forms a coated (with clathrin) vesicle? a. Pinocytosis b. Phagocytosis c. Receptor-mediated endocytosis d. Exocytosis 49. If a fresh water fish is transferred to salt water, what could happen to the fish? a. b. c. d. e. It will lose water and die It will gain water and die Its cells will build turgor pressure Its cells will plasmolyze Nothing will happen 50. The procedure for detecting chromosomal abnormalities in a fetus is termed a. Ultrasound b. Fetus biopsyExplanation / Answer
Answer 41. Prophase. During prophase chromosome condense, nucleolus disappear and nuclear envelope is broken.
Answer 42. 47, +21. In down syndrome there is a trisomy of chromosome number 21.
Answer 43. Option C. More genetic variations among the offsprings. Crossing over causes recombination that leads to more genetic variation.
Answer 44. Option D. Karyotyping is the technique used to detect chromosomal abnormalities.
Amswer 45. Option C. Meiosis results in 4 daughter cells with half as much DNA than that of the parent cell. It is the reason it is known as reduction division.
Answer 46. Option A. Chromosome number 1 is the largest human chromosome. It has about 249 million nucleotide base pairs.
Answer 47. False. Homologous chromosomes are similar but not genetically identical.
Answer 48. Option C. Receptor mediated endocytosis is also known as clathrin mediated endocytosis.
Answer 49. Option A. It will loose water and die. Fresh water fish cannot tolerate the salinity of the salt water and will loose all the water in their body if transferred to saltwater.
Answer 50. Amniocentesis. It is the process in which amniotic fluid is taken via a needle to check developing fetus for any abnormalities.
Answer 51. Option C. Pairing of homologous chromosomes occurs in meiosis, which doesn't not happen in case of skin cells. In skin cells only mitosis takes place.
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