Biological termEasy1 mark
1(a)
Name the following:
The point of attachment of two chromatids.
Topic: Centromere
Previous-year question practice database
Answer
Exam answer
CENTROMERE.
Explanation
The centromere is the constricted point joining the two identical sister chromatids of a duplicated chromosome, and the point to which the SPINDLE FIBRES attach.
Keep the three similar words apart: CENTROMERE — on the CHROMOSOME, joining the chromatids CENTRIOLE — the cylindrical structures in the cytoplasm of an animal cell CENTROSOME — the organelle containing the centrioles
The splitting of the centromere is the defining event of ANAPHASE: until then the two chromatids are one chromosome, and the instant it divides they become two.
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