Card Set Information
animal plant genetics
T/F DNA can function in any form whether it is condensed in chromosomes or not.
False DNA cannot function in condensed form
______ are the vehicles that organize and carry the DNA from generation to generation by either the process of mitosis or meiosis
What is it called when Chromosomes are organized by their size?
T/F the number of Chromosomes in a species tells how complex a species is.
False, chromosome number does not have any significance
Set of protiens that attach to spindle fibers
Name the four ways a kinetochore can be positioned and explain
meta- middle, submeta- a lil above or below middle, acro-found on far end, telocentric- found at very end of pairs
2 haploid cells combined at conception produce a diploid _____
There are two major cell types that do not reproduce, what are they?
Heart and Nerve cells
Name and very generally describe the phases of the cell cycle
Interphase- cell growth through G1, S and G2 and M-Phase- nuclear and cell division through mitosis or meiosis
What happens to a cell with 4 chromosomes (2n=4) as it goes through the cell cycle (interphase and mitosis)? name number or chromosomes, DNA mol and Chromatids at each phase
G1- 4 chromosomes, 4 DNA mol, 4 chromatids
S/G2- 4Chromosomes, 8 DNA mol, 8 chromatids
Prophase- nuclear membrane disappears spindles form, 4 Chromosomes, 8DNA mol, 4 Chromatids
Metaphase- 4 chrom, 8 DNA mol, 4 Chromatids
Anaphase- 4+4 chromo, 8DNA, 0 Chromatids
Telophase- 4+4 chromo, 4+4 DNA, 0 chromatids
cytokinesis- 4 chromo, 4 DNA mol, 0 chromatids
Name and explain each Prophase I step of meiosis.
Lepotene- chromosomes condense,
Zygotene- condense + bivalents form w/synaptonemal complex to hold them together
Pachytene- condense+ crossing over and recombination
Diplotene- chiasmata hold bivalents together. Synaptonemal complex dissolves
Diakinesis- nucelar membrane disolves and spindles attach to bivalents
When do bivalents come apart or reduce?
Anaphase I of meiosis
when do chromosomes come apart or reduce in meiosis?
what enzyme is responsible for seperating chromatids during cell division?
what happens to a cell with 4 chromosomes as it goes through meiosis and the cell cycle? explain number of chromosomes, DNA mol and chromatids
Prophase I- 4 Chromo, 8 Chroma, 8 DNA mol, 2 bivalents
MetaphaseI- 4 chromo, 8 chroma, 8 DNA mol, 2 Bivalnets
Anaphse I- 2+2 Chromo, 4+4 chroma, 8 DNA, 2 Bivalents
TelophaseI- 2+2 chromo, 4+4 chroma, 8 DNA, 2 bivalents
Metaphase II- same
Anaphase II- 2+2 Chromo, 0Chroma, 4+4 DNA, 0Bivalent