Diaploid and Haploid?

Question

Does Diaploid mean two copies of chromotid(' l '), or two copies of chromosomes(' X ')?
Same as haploid, does it mean one copy of chromotid, or one copy of chromosome?

Answer 1

Diploid - two of every kind of chromosome
Haploid - one of every kind of chromosome

Refers to chromosomes, not chromatids

Answer 2

Diploid means there are two copies of each chromosome ('X'). Each chromosome comprises two chromatids joined at a centromere (which is not necessarily in the centre), although this only becomes obvious during nuclear division.

Haploid means there is only one copy of each chromosome present in the nucleus of the cell, e.g. in gametes or sex cells. Haploid chromosomes often have genes form both parents, since crossing over of sister chromatids occur before first meiotic division.

A nucleus in which the chromosome numbers are different form haploid or diploid configuration is said to display aneuploidy. When there are more than two copies of each chromosome, polyploidy is said to occur (e.g. triploidy, tetraploidy etc).

Answer 3

Diploid (2n) cells have two copies of each chromosome (X) usually one from the mother and one from the father
The haploid number is the number of chromosomes in a gamete of an individual. therefore 1

Answer 4

two copies of chromosomes for diploid
one copy of chromosome for haploid.
A chromatid is one of two identical strands of DNA making up a chromosome that are joined at their centromeres,