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Updated: June 18, 2025
In a second class of cases the sex-chromosome is double, consisting of two components which pass together to one pole. Examples of this are Syromaster, Phylloxera, Agalena. In a third class the sex-chromosome is accompanied by a fellow which is usually smaller, and the two separate at the differential division.
The sex-chromosome in the male gametocytes is single and fails to divide with the others, but passes undivided to one pole. But it is difficult to understand what is meant by 'fails to divide. In one of the reduction divisions all the chromosomes divide as in ordinary or homotypic nucleus division, but in the other the chromosomes simply separate into two equal groups without division.
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