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Novosadov [1.4K]
3 years ago
15

You identify a new fish species in the UCSB pond. The fish is diploid and shows 40 chromosomes in its somatic cells. Following m

itosis, each daughter cell will have ____ chromosomes. After meiosis I, each daughter cell has ___ chromosomes, each formed by _____ chromatid(s). After meiosis II, each daughter cell is ___.
Biology
1 answer:
Eva8 [605]3 years ago
3 0

Answer:

40 chromosomes, 20 chromosomes, 2 chromatids, haploid

Explanation:

Mitosis is a type of cell division that results in two identical daughter cells with the same number of chromosomes as the parent cell. The fish is a diploid with 40 chromosomes (80 chromatids), after the separation of sister chromatids during the anaphase of mitosis, each sister chromatid becomes a chromosome i.e 40 chromatids (chromosome) each moves to the opposite poles and after the cell divides (cytokinesis), each daughter cell will have 40chromosomes each.

Meiosis is a type of cell division that results in four daughter cells with each having half of the parental number of chromosomes. It involves two divisions; Meiosis I and Meiosis II

In meiosis I, homologous chromosomes lie side by side to form a structure called tetrad or bivalent consisting of 4 chromatids. During anaphase I, 20 chromosomes are pulled apart to each pole with each chromosome containing 2 chromatids. After cytokinesis in meiosis I, each of the two cells will have 20 chromosomes (40 chromatids) i.e 1 chromosome = 2 chromatids

At the end of meiosis II, which is similar to mitosis, chromatids are pulled apart and each becomes a chromosome, meaning 20 chromatids will be separated to each pole and become 20 chromosomes in each cell after cytokinesis. Since the parental organism was a diploid with 40 chromosomes, and the resulting daughter cells now have 20 chromosomes each, it shows that the chromosomal number has been reduced by half. 2n ---- n

Diploid organism produce haploid daughter cells

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