| | |
| [Embryo] | theterm used to describe a developing human from conception to 8 weeks of development
|
| [Egg] | the female reproductive cell, also called the ovum. the egg carries 23 chromosomes, 22 autosomes and an x chromosome. the egg fuses with the sperm at conception to produce an embryo.
|
| [Duplication] | when partof chromosome is present in two or more copies.
|
| [Down syndrome] | trisomy 21
|
| [DNA] | deoxyribonucleicacid; the basic material of heredity. dna is a large molecule that carries the genetic information that cells need to replicate and to produce proteins. it is made up of chemicals called nucleotide bases, linked together in a spiral-shaped chain called a double helix.
|
| [Disomy] | two copies of each chromosome. this is the normal chromosome complement.
|
| [Disomic] | twocopies of a chromosome.
|
| [Diploid] | the fullset of genetic material. in humans, the diploid number is 46. there are two copies of each chromosome, one chromosome from each parent.
|
| [Differentiate] | when a stem cell (a cell that has the potential to become any cell in the human body) permanently becomes a specialized cell (such as a red blood cell), it has differentiated. |
| [Deletion] | the loss of a segment of the genetic material from a chromosome.
|
Views.