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Chapter 3: Problem 3

What is a sister chromatid? Are sister chromatids genetically similar or identical? Explain.

Short Answer

Expert verified
A sister chromatid is the identical copy of a single chromosome, still connected to the original chromosome at the centromere. Sister chromatids are not just genetically similar, but they are genetically identical because they are the result of the DNA replication of a single chromosome.

Step by step solution

01

Definition of Sister Chromatids

A sister chromatid refers to the identical copy of a single chromosome that is still joined to the original chromosome by a structure called the centromere. During replication of cells (called mitosis in eukaryotes), each chromosome is replicated, and the two resulting copies are half of these sister chromatids.
02

Genetic Identity of Sister Chromatids

After DNA replication, each chromosome consists of two sister chromatids containing identical genetic information. Therefore, sister chromatids are not just genetically similar, they are genetically identical.

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Most popular questions from this chapter

A cell has four pairs of chromosomes. Assuming that crossing over does not occur, what is the probability that a gamete will contain all of the paternal chromosomes? If \(n\) equals the number of chromosomes in a set, which of the following expressions can be used to calculate the probability that a gamete will receive all of the paternal chromosomes: \((1 / 2)^{n},(1 / 2)^{n-1}\), or \(n^{1 / 2}\) ?

Assuming that such a fly would be viable, what would be the sex of a fruit fly with the following chromosomal composition? A. One \(X\) chromosome and two sets of autosomes B. Two X chromosomes, one \(Y\) chromosome, and two sets of autosomes C. Two \(\mathrm{X}\) chromosomes and four sets of autosomes D. Four \(\mathrm{X}\) chromosomes, two \(\mathrm{Y}\) chromosomes, and four sets of autosomes

A eukaryotic cell is diploid and contains 10 chromosomes ( 5 in each set). In mitosis and meiosis, how many daughter cells will be produced, and how many chromosomes will each one contain?

Nine-banded armadillos almost always give birth to four offspring that are genetically identical quadruplets. Explain how you think this happens.

With regard to sister chromatids, which phase of mitosis is the organization phase, and which is the separation phase?
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