Flashcards in Genetics Deck (11):
DNA molecule with all or part of the genetic information for a cell. 46 (23 pairs) in each cell.
1) A cell creates a copy of the chromosones.
2) The parent cell splits into two daughter cells.
Identical diploid (normal amount of chromosones) cells.
Have a limit of fifty for how many times they can divide.
Also used for asexual reproduction.
Cell division that only occurs when the body forms gametes. Its purpose is to increase genetic variation.
1)Parent cell creates a copy of chromosones
2)Parent cell splits
3)Daughter cells split
Process produces HAPLOID cells (only 23 chromosones)
During the process, chromosones can cross & exchange info, in an effort to make more variation.
Cells (gametes) with only 23 chromosones
Cells with 46 chromosones
Why do humans look similar, but have small differences?
Because we all have the same genes, but a slightly different number of alleles
Variant form of gene, eg. eye colour.
Doxyribose nucleic acid. Chemical substance present in the nucleus of all cells of living organisms. Controls chemical changes that take place in cells, the type of cell formed, type of organism. A long molecule made up of sub units called nucleotides.
Sub unit of DNA, made up of:
A sugar called deoxyribose
A phosphate Group -PO4
An organic base
Ribose is a sugar, like glucose, but with 5 carbon atoms instead of 6.
Deoxyribose is almost the same, but lacks an oxygen atom.