If each cell of sporetetrad has 7 chromosomes How many chromosomes are found in a dividing root tip cell in anaphase
Answers
Answer:
Definition : It is also called indirect cell division or somadtic cell division or equational division. In this, mature somatic cell divides in such a way that chromosomes number is kept constant in daughter cells equal to those in parent cell, so the daughter cells are quantitatively as well as qualitatively similar to the parental cell. So it is called equational division
(2) Discovery : Mitosis was first observed by Strasburger (1875) and in animal cell by W.fleming (1879) term mitosis was given by Fleming (1882).
(3) Occurrence : Mitosis is the common method of cell division. It takes place in the somatic cells in the animals. Hence, it is also known as the somatic division. It occurs in the gonads also for the multiplication of undifferentiated germ cells. In plants mitosis occurs in the meristematic cells e.g. root apex and shoot apex.
(4) Duration : It ranges from 30 minutes to 3 hours time is species-specific but also depends upon type of tissues, temperature.
(5) Process of mitosis : Mitosis is completed in two steps
Karyokinesis: (Gk. karyon = nucleus; kinesis = movement) Division of nucleus. Term given by Schneider (1887).
Cytokinesis: (Gk. kitos = cell; kinesis = movement) Division of cytoplasm, Term given by Whitemann (1887).
Karyokinesis
It comprises four phases i.e. Prophase, Metaphase, Anaphase, Telophase.
Answer:
28
Explanation:
ploidy of spore is haploid(n)
as per the question,
n=7
so, 2n=14
in anaphase of mitosis, the chromosome number doubles in a cell as the centromere splits and each half of the chromosomes move to the opposite poles. Hence, 14×2=28