Question

The fourth cleavage plane during development of frog's egg is

• A. Double meridional
• B. Single meridional
• C. Single latitudinal
• D. Double latitudinal

Answer 1

The correct option is A Double meridional

• The fertilized egg can be divided into different planes during the process of cleavage.
• The first and second cleavage is meridional. The first cleavage produces two blastomeres and the second cleavage produces four equal-sized blastomeres.
• The third cleavage is latitudinal which results in eight blastomeres. The large ones are called macromeres and small ones are called micromeres.
• The fourth set of cleavage includes the plane which is meridional and holoblastic.
• They are unequal and divide the micromeres more rapidly than macromeres.

Thus, the correct answer is option A.