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Question
Prior to division, each chromosome is composed of two genetically identical parts called ________
Prior to division, each chromosome is composed of two genetically identical parts called ________
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Solution
The correct option is D Sister chromatids
.A sister chromatid refers to either of the two identical copies (chromatids) formed by the replication of a single chromosome, with both copies joined together by a common centromere. In other words, a sister chromatid may also be said to be 'one-half' of the duplicated chromosome.
A tetrad will have two centromeres and four chromatids (because it is made from two chromosomes). Recall that a dyad was a single (X-shaped) chromosome so a tetrad is composed of two dyads.
Nucleosomes a structural unit of a eukaryotic chromosome, consisting of a length of DNA coiled around a core of histones.
The DNA double helix in the cell nucleus is packaged by special proteins termed histones. The formed protein/DNA complex is called chromatin.
.A sister chromatid refers to either of the two identical copies (chromatids) formed by the replication of a single chromosome, with both copies joined together by a common centromere. In other words, a sister chromatid may also be said to be 'one-half' of the duplicated chromosome.
A tetrad will have two centromeres and four chromatids (because it is made from two chromosomes). Recall that a dyad was a single (X-shaped) chromosome so a tetrad is composed of two dyads.
Nucleosomes a structural unit of a eukaryotic chromosome, consisting of a length of DNA coiled around a core of histones.
The DNA double helix in the cell nucleus is packaged by special proteins termed histones. The formed protein/DNA complex is called chromatin.
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