SCIENCE
GENETIC AND MENDELS LAW OF HEREDITY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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1,2 and 4
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2,3 and 4
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1 and 3
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1,3 and 4
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Detailed explanation-1: -Normal human body cells are diploid. The basic chromosome number of human cell is n=23. So, a normal cell has 2n= 46 chromosomes out of which 44 are autosomes and 2 are sex chromosomes. Thus, the correct answer is D.
Detailed explanation-2: -Each daughter cell will have half of the original 46 chromosomes, or 23 chromosomes. Each chromosome consists of 2 sister chromatids. The daughter cells now move in to the third and final phase of meiosis: meiosis II.
Detailed explanation-3: -In plants and animals (including humans), chromosomes reside in the nucleus of cells. Humans have 22 pairs of numbered chromosomes (autosomes) and one pair of sex chromosomes (XX or XY), for a total of 46.
Detailed explanation-4: -Healthy humans have 46 chromosomes, 23 from the sperm and 23 from the egg. An embryo with the wrong number of chromosomes is usually miscarried, or develops disorders such as Down’s syndrome, which is caused by an extra copy of chromosome 21.
Detailed explanation-5: -Normally, each cell in the human body has 23 pairs of chromosomes (46 total chromosomes). Half come from the mother; the other half come from the father. Two of the chromosomes (the X and the Y chromosome) determine your sex as male or female when you are born.