Group( D )

Genes :

Euchromatin:

....Condensed throughout the cell cycle

Genomes ..... of human and mouse genes are homologous

paternal age does increase risk of chromosome abnormalities.

the environment may play a role in the occurrence of genetic errors

Errors can also occur when the chromosomes are being duplicated

In a reciprocal translocation, segments from two different chromosomes have been exchanged. in a .......

errors in cell division can result in cells with too few or too many copies of chromosome.

....... in cells with half the number of chromosomes, 23, instead of the normal 46.

cell division This kind of cell division occurs throughout the body, except in the reproductive organs

in two cells that are duplicates of the original cell One cell with 46 chromosomes divides and becomes two cells with 46 chromosomes each.

Chromosome abnormalities usually occur when there is an error in cell division.

Most chromosome abnormalities occur as an accident in the egg or sperm

....female is born with only one sex chromosome an x

An individual with Down syndrome has ...... of chromosome 21 rather than two;

An example of a condition caused by numerical abnormalities is ......مهمه

shorter arm is called the ".....

Many chromosomes have two segments, called "arms,"

the final part of a chromosome called: