Haploid and diploid numbers are designated by the algebraic notations N and 2N, respectively. Either number can be calculated when the other is known. For example, if the haploid number (N) is 3, the diploid number (2N) is 2 × 3, or 6. If the diploid number (2N) is 12, the haploid number (N) is 12/2, or 6.

The table shows haploid or diploid numbers of a variety of organisms. Copy the table into your notebook and complete it. Then, use the table to answer the questions that follow.

The complete table is shown below:

Organism             Haploid Number      Diploid Number

Amoeba               N = 25                      2N = 50Chimpanzee        N = 24                      2N = 48Earthworm           N = 18                       2N = 36Fern                      N = 505                   2N = 1010Hamster               N = 22                      2N = 44Human                  N = 23                     2N = 46Onion                    N = 8                       2N = 16

Explanation:

Ploidy is a term used for the number of chromosomes that exist in a cell.

A haploid cell is one that contains only half of the chromosome (N) load, which is seen only in gametes. These cells come from a diploid cell and are subjected to a process of halving the chromosomes by meiosis. Diploid cells contain the full chromosome load (2N) and are somatic cells. The way a diploid cell multiplies is through mitosis.

The number of chromosomes in a diploid cell is always a par number.

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