Multiple Choice
In the context of interacting genes, how many potential phosphorylation sites are present within the nuclear localization sequence of MYOD1?
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3. Extensions to Mendelian Inheritance
Overview of interacting Genes
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Sister chromatids of a chromosome are:
A
homologous chromosomes inherited from each parent
B
chromosomes that have undergone crossing over
C
identical copies of a chromosome joined together by a centromere
D
non-identical chromosomes that segregate during meiosis I
Verified step by step guidance1
Understand the definition of sister chromatids: Sister chromatids are two identical copies of a single chromosome that are connected by a centromere after DNA replication.
Recall that homologous chromosomes are pairs of chromosomes (one from each parent) that have the same genes but are not identical copies; they are separate chromosomes, not sister chromatids.
Recognize that crossing over occurs between homologous chromosomes, not between sister chromatids, so sister chromatids themselves are not chromosomes that have undergone crossing over.
Note that sister chromatids are identical, whereas homologous chromosomes are non-identical and segregate during meiosis I.
Conclude that the correct description of sister chromatids is that they are identical copies of a chromosome joined together by a centromere.
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