The number of nuclei present in a zygote is
Option A: none
Option B: one
Option C: two
Option D: four
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Is the chromosome number of zygote, embryonal cells and adult of a particular organism always constant?
Yes, the constancy is maintained because cells in all these three structures undergo only mitotic divisions.
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What would be the ratio of chromosome number between an egg and its zygote? How is the sperm genetically different from the egg?
The ratio is 1 : 2. Sperms contain either X or Y chromosome whereas an egg will always have an X chromosome.
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The number of pair (s) of sex chromosomes in the zygote of humans is
(a) one , is the correct option.
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Internal fertilization occurs Option A: in female body. Option B: outside female body. Option C: in male body. Option D: outside male body.
Correct Option: A Internal fertilization occurs inside female body
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A positive number is 5times another number. If 21 is added to both the numbers, the none of the new numbers becomes twice the other new number.
Let one of the number be x second number be 5x 2(x+21)=(5x+21) => 2x+42=5x+21 => 2x−5x=21−42 => −3x=−21 x=7 One of the number 7 Second number 7×5=35 Answer : 7,35
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Shobo’s mother’s present age is six times Shobo’s present age. Shobo’s age five years from now will be one third of his mother’s present age.
At present, _________ Shobo's age = x years His mother's age = 6 times of Shobo's age = 6x years Five years from now ________________ Shobo's age = ( x + 5 ) years According to the problem given, x...
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What would be the ratio of chromosome number between an egg and its zygote?
The ratio is 1 : 2. Sperms contain either X or Y chromosome whereas an egg will always have an X chromosome.
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Statement-1 : Energy is released when heavy nuclei undergo fission or light nuclei undergo fusion.
(a) : Statement-1 states that energy is released when heavy nuclei undergo fission and light nuclei undergo fusion is correct. Statement-2 is wrong The binding energy per nucleon, B/A, starts at...
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Seema’s present age is four times her son’s present age and four-seventh of her father’s present age.
(b) Let Seema’s present age be x years. Then, Seema’s son’s present age = x/4 years Seema’s father’s present age = 7x/4 years. Then, x+ x/4 +7x/4= 32x3 12x = 96 × 4 x = 96...
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Double fertilization is (1) Fusion of two male gametes of a pollen tube with two different eggs (2) Fusion of one male gamete with two polar nuclei
(4) Syngamy and triple fusion
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