In the nuclei of the retinal cells of the cartilaginous fish there are 26 pairs of chromosomes. How many chromosomes will the zygote nucleus of this animal have?
Cartilaginous fish are diploid organisms. Accordingly, each cell contains a double set of chromosomes (including the cells of the retina), except for the sex cells, which are haploid. A zygote is formed when the sex haploid cells merge, which leads to a duplication of chromosomes. She is also diploid. Since the number of pairs of chromosomes in the retina is 26, there are the same number in the zygote. The task asks to calculate how many chromosomes are in the zygote, therefore, multiply the number of pairs by 2: 26 * 2 = 52 chromosomes are contained in the zygote of cartilaginous fish.
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