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Biology 113 Unit 3

Biology Unit 3

QuestionAnswer
Length of mitosis and meiosis g1+s1+g2= ~15hrs actual dividing ~40mins
what happens in the g1 phase gap1 = growth 1 = number of organelles doubles
what happens in the g2 phase gap2=growth2= protein synthesis increases
what happens in the s phase synthesis of dna= dna replication one chromadids turns to two sister chromidids which are identical and connect by a centromere
name of the unduplicated chromosome chromadid
name of a duplicated chromosome chromatids
how many autosomes (nonsex chromosomes) are there 22- mother 22- father
how many homologous chromosomes are there 23 female 22 male
What are the type of gametes male-sperm-spermatozoa female- eggs-ova
What is the process of spermatogenesis (testes) meiosis I- Primary spermatocyte yields two spermatid in the secondary spermatocyte Lastly they mature into 4 spermatozoan
What is the process of OOgenesis (ovaries) Primary oocyte Gets divided into two eggs one almost as big as the parent and the other really small. the Larger egg splits again into a ootid and then the larger one matures into a ovum and another small egg is created which gets destoried
Interphase Chromtin duplicate however 4 chromosomes are still in the cell (G1 -> S ->G2)
Stage 1 of Mitosis Prophase - chromosomes are now visible chromtin condenses into chromatid nucleus, nucleolus and nuclear envelope disappear Simple fibers begin to form
Phase 2 of Mitosis Metaphase - spindle fibers are fully formed individual chromosomes line up at the equator
Phase 3 (early) nuclear division takes place = centrolenes divide Sistser chromtides more apart (split) 8 chromosomes
Phase 3 (late) cytokinesis cytoplasmic division
Phase 4 Telophase cytokinesis is complete spindle fibers disappear nucleus, nucleolus and nuclear envelope reappear chromosomes decondense into chromatid
Created by: lilram
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