Differentiation among blastomeres is the result of A) regulator molecules suppli

Question

Differentiation among blastomeres is the result of A) regulator molecules supplied by cells of the uterus B) an unequal distribution of regulatory molecules in thecytoplasm of the ovum C) enzymes activaated by the sperm D) hormones produced by the ovum E) enzymes introduced by the sperm Differentiation among blastomeres is the result of A) regulator molecules supplied by cells of the uterus B) an unequal distribution of regulatory molecules in thecytoplasm of the ovum C) enzymes activaated by the sperm D) hormones produced by the ovum E) enzymes introduced by the sperm

Explanation / Answer

According to my textbook (Campbell 2008), page 1025: "During cleavage, different regions of cytoplasm present in theoriginal undivided egg end up in separate blastomeres. Because theregions may contain different cytoplasmic determinants, such asspecific mRNAs and proteins, in many species this partitioning setsthe stage for subsequent developmental events". So it's due to the regulatory molecules in the cytoplasm of theegg.

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