Question

I dont understand haploid and diploid? can anyone explain briefly??

Answer 1

Haploid cell has single copy of chromosome while diploid has two copies of the same chromosome. e,g egg and sperm cells r haploid while remaining cells other than them r diploid like skin cell, wbcs etc.. As a matter of fact liver cells may have more than two copies of the same chromosome.

Answer 2

in adding info to nazima's text haploid is always denoted by symbol n and diploid by 2n

Answer 3

if u pot ur doubt @maths911 so we are able to help u in dat point.

Answer 4

*post

Answer 5

1) I don't understand why diploid is said to be 2n and diploid is n?
2) Let say if a parent cell have 4 chromosome. How do we count the chromosome in a the daughter cell. I'm so confused.

Answer 6

Diploid is 2n because the Diplo- part refers to something being doubled. Haplo- means "single", so haploid cells are n.

The n is the number of chromosomes in a gamete (i.e. a sex cell: egg or sperm) -- it might help to think of it as the number of different types of chromosomes. Gametes are always haploid. When the egg (haploid, so n) and the sperm (also haploid) combine, they create a diploid (2n) zygote that then has two versions of each chromosome, one from the mum and one from the dad.

Answer 7

male gamete cell and female gamete cell has to fuse to form a zygote assume that parents have four chromosomes each but when they fuse zygote will be having 8 chromosomes and that will not be viable so nature has developed a process called meiosis by which both male and female gametes get reduction division n have half of same chromosomes
for e,g chromosome no. 1 has two copies, gametes will b having only one of it, so that when male and female gamete fuse zygote will get 2 copies of chromosome no 1 not 4
hope this will help

Answer 8

May i ask, red blood cell do not have chromosome/?

Answer 9

Mature red blood cells don't have a nucleus, but that's quite unusual, and they do start off with one, I believe.

Answer 10

no they don't have nucleus. that is y they r called corpuscles not cells

Answer 11

@nazima: I've only ever heard them referred to as cells. You can call them corpuscles if you want (I think it's a bit old-fashioned), but typically, they're called "red blood cells" or "erythrocytes".

Answer 12

@calliope i totally agree but there r certain misnomers in science which v can change bec they have been there for a long time and people r so used to it that v cant change it red blood cell is such a misnomer.

Answer 13

cant change

Answer 14

I don't think it's a misnomer. And incidentally, plenty of scientists used "corpuscles" back in the 19th century... but at some point, they appear to have stopped. A cell does not absolutely have to have a nucleus, after all, and red blood cells actually do have one (and other organelles) for part of their development.

Germans actually still talk about "Blutkörperchen" (which is more or less a translation of "blood corpuscles", but they're quite fond of old-fashioned terminology. They still call Paramecia "Pantoffeltierchen" (little slipper animals).

Answer 15

Of course, I could be wrong... but what I learned is that a red blood cell starts off as something that anyone would identify as a eukaryotic cell, and then it loses its nucleus and other organelles, becoming an anucleated cell in its mature form.

Answer 16

@calliope you are right rbc's starts off with nucleus and loses it later on, the process is called as erythropoeisis u can check this link hopefully it will help u.
http://en.wikipedia.org/wiki/Erythropoiesis