TLS Online TPP Program

#Question id: 5104


 In humans, identical twins are possible because ________.

#Unit 5. Developmental Biology
  1. cytoplasmic determinants are distributed unevenly in unfertilized eggs

  2. extraembryonic cells interact with the zygote nucleus

  3. early blastomeres can form a complete embryo if isolated

  4. the gray crescent divides the dorsal-ventral axis into new cells