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Two chromatids are present in a chromosome at the beginning of mitosis.
Before mitosis begins, a cell has a diploid number of chromosomes, which means there are two sets of chromosomes. This is because during interphase, before mitosis begins, the DNA has already replicated, so the cell contains identical copies of each chromosome.
A single member of a pair of chromosomes in a cell is known as a haploid. Haploid cells contain only one set of chromosomes, typically found in reproductive cells such as eggs and sperm. This is in contrast to diploid cells, which contain two sets of chromosomes.
Mitosis will separate the sister-chromatids of each chromosome, and each will now be called a chromosome (or daughter-chromosome).Without cytokinesis, the mother-cell will not split into two daughter-cells. The result will be a cell with twice as many chromosomes as the mother-cell.Since an unfertilized egg (ovum) is a gamete, it must be haploid. Doubling the number of chromosomes will produce a diploid cell.
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In metaphase of meiosis 1, the haploid number of chromosomes is present at the equator of the spindle. Each chromosome is made up of two chromatids.
Yes, homologous chromosomes are present in both mitosis and meiosis. In mitosis, homologous chromosomes do not pair up, while in meiosis, homologous chromosomes pair up during prophase I.
The y-chromosome is only present in males. Men will a y-chromosome identical to that of their father, and his father, and his father, etc.
There are a total of four sister chromatids present during anaphase of mitosis. Each replicated chromosome consists of two sister chromatids that are held together by a centromere. During anaphase, these sister chromatids separate and are pulled to opposite poles of the cell by the spindle fibers.
Normally in a cell, there are 92 chromatids, 2 per chromosome. However, when the chromosomes have duplicated before mitosis, there are twice as many, or 184.
No - the colour blindness gene is only found on the X chromosome.
There are two sex chromosomes: the X chromosome and the Y chromosome. During fertilization, the mother always gives an X chromosome and the father gives either another X chromosome or a Y chromosome. Therefore, all humans have at least one X chromosome.