Flashcards in Chapter 8 (PART 2) Deck (22):
2n = 2 sets of CHROMOSOMES
***Germ cells are ____ goin in, end of mitosis they're half way _______
diploid / gametes
1n = 1 copy of chromosomes
-cell division that reduces a diploid cell’s chromosome # by HALF, producing haploid GAMETES
-PAIRS of similar chromosomes, one from each parent
-each species has a characteristic...
# of chromosomes
W/O meiosis, chromosome #’s
Meiosis includes one round of chromosome replication flowed by _____ divisions
TWO cell divisions
In Meiosis l...
diploid parent cell divides to produce TWO HAPLOID daughter cells containing REPLICATED chromosomes
-ONLY time you have homologous pairing
-2 members of each homo pair are SEPARATED
-sister chromatids are SEPARATED
Down Syndrome is the result of having...
-3 copies of chromosome 21
-2 copies come from egg, ONE copy from sperm
-too many or too few chromosomes
-place in Meiosis l
Mitosis leads to ____ genetically identical daughter cells
Genetic variation arises through ______ ________ during Meiosis 1
Crossing Over (c/o)
-trade parts btwn. homo chromosomes
-gives chance of more combinations
-chromosomes are given randomly along the equator of cell
-more combinations of MAternal & PAternal traits
Number of possible combinations of chromosomes is 2n, where “n” is the ______ #
Resulting variations in offspring produce differences in...
fitness, raw material which natural selection acts
_______ reproduction may be advantage in constant environments
Genetic variability made by _____ _______ may be helpful in CHANGEABLE environments
Mitosis accomplishes 2 things...
1) reproduction of cells
2) equal issuing of DNA to each daughter cell