1. Name the following:
(a) The shortest stage of mitosis.
(b) The structure which initiates cell division in animal
cell.
(c) The tip of the chromosome which are rounded
and sealed.
(d) The type of chromosome whose centromere is
in the middle.
(e) The stage of mitosis during which nuclear
membrane and nucleolus reappears.
(0) A membrane that disappears during late
prophase.
(9) A pair of chromosomes carrying dissimilar
alleles for a particular character.
(h) Acts as bearer of heredity units.
(6) Two animals which have nineteen pairs of
chromosomes.
0) A region of plant body where cell division occurs
very actively
(k) Structure that initiates cell division.
() Chromosomes appear thread like.
(m) The type of cell division which occurs in the cells
of the reproductive organs.
(n) The exchange of chromatid parts between the
maternal and paternal chromatids of a pair of
homologous chromosomes during meiosis.
(0) The number of chromosomes present in a nerve
cell of a human being.
Answers
Answer:
Itna Bada question.. Nahi solve kar pauga...
Answer:
(A) The shortest phase of mitosis is anaphase, which comes after metaphase. In this phase, the sister chromatids separate and move towards opposite poles. It is followed by telophase.
(B) Centriole
(c) Telomere
(d) metacentric chromosome
(e) Telophase
(f)nuclear membrane
(g)
(h) A chromosome is acted as the bearer of heredity of units in our body.
(i) Animals such as lions, pigs, cats, raccoons, sea otters, etc. have 19 pair of chromosomes.
(j)Meristematic tissues
(k) Centriole
(l) prophase
(m)Meiosis. A specialized division of chromosomes called meiosis occurs during the formation of the reproductive cells, or gametes, of sexually reproducing organisms.
(n)During meiosis, the exchange of chromatids parts between the maternal and the paternal chromatids of a pair of homologous chromosomes is called crossing-over.
(o) 23 pair i.e 46 chromosome