Patterns of Cleavage
Patterns of Cleavage
Although cleavage is usually very regular within a species, there is considerable variation between species with regard to cleavage pattern. The pattern of cleavage is greatly affected by (1) quantity and distribution of yolk present and (2) genes controlling the symmetry of cleavage. Four principal types of cleavage are shown in Figure 8-7.
Although cleavage is usually very regular within a species, there is considerable variation between species with regard to cleavage pattern. The pattern of cleavage is greatly affected by (1) quantity and distribution of yolk present and (2) genes controlling the symmetry of cleavage. Four principal types of cleavage are shown in Figure 8-7.
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