Multiple Choice
Meiosis is responsible for genetic variation while mitosis is responsible for genetic _____________.
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9. Mitosis and Meiosis
Mitosis
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During mitosis, centromeres attach ______ to each other.
A
homologous chromosomes
B
sister chromatids
C
nuclear membranes
D
spindle fibers
Verified step by step guidance1
Understand the structure of chromosomes during mitosis: each chromosome consists of two identical sister chromatids joined together at a specific region called the centromere.
Recall that the centromere is the point where sister chromatids are physically connected, ensuring they stay together until they are separated during anaphase of mitosis.
Recognize that homologous chromosomes are pairs of chromosomes (one from each parent) that are similar but not identical, and they do not attach to each other at the centromere during mitosis.
Note that spindle fibers attach to the centromere via the kinetochore to help separate sister chromatids, but the centromeres themselves do not attach to spindle fibers or nuclear membranes.
Conclude that during mitosis, centromeres attach sister chromatids to each other, which is essential for proper chromosome segregation.
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