at metaphase of mitosis, each chromosomeas consists of ___ chromatid(s) and ___ centromere(s)
a. 1,1
b. 2,1
c. 2,2
d. 1,2
2007-02-18 17:21:41 · 6 answers · asked by iloverocknroll09 1 in Science & Mathematics ➔ Biology
b. 2 sister chromatides/ one centromere
In eukaryotic cells, replicated chromosomes (sister chromatides) remain physically connected through their centromere from their synthesis in S phase until they are separated during anaphase. This phenomenon, called sister chromatid cohesion, is essential for the temporal separation of DNA replication and mitosis and for the equal separation of the duplicated genome. The cohesion between the chromatids is ensured by a class of proteins called cohesins (which include structural maintenance of chromosomes 1p (Smc1p), Smc3p and sister chromatid cohesion 1p (Scc1p)), that are degraded at anaphase.
2007-02-18 17:55:16 · answer #1 · answered by Jesus is my Savior 7 · 0⤊ 0⤋
B: 2 chromatids joined by one centromere
2007-02-18 18:09:38 · answer #2 · answered by MLG 2 · 0⤊ 0⤋
b
2007-02-18 17:29:45 · answer #3 · answered by Jay S 5 · 0⤊ 0⤋
b
2007-02-18 17:26:19 · answer #4 · answered by CAROL P 4 · 0⤊ 0⤋
B
2007-02-18 18:25:34 · answer #5 · answered by moralesw 1 · 0⤊ 0⤋
B.
2007-02-18 17:24:14 · answer #6 · answered by Anonymous · 0⤊ 0⤋