EMBRYOGENESIS
Fertilization
• Haploid mature spermatozoon (1N (1 copia DNA), 1C (1 cromátida))
• Haploid ovum (1N, 1C)
• Forms zygote (2N, 2C) (óvulo fecundado)
DNA Synthesis
• Maternal/paternal DNA in “pronucleus”
•2N, 2C (zygote) →DNA synthesis (duplica cromatidas) →chromatids (intercambian
cromatidas)→2N, 4C
• Finally, Zygote divides into two cells (2N, 2C) (cada una con DNA de madre y padre)
Fetal Development
• Fertilization takes place in fallopian tubes
• After 1 day after fertilization, the zygote gets into first cleavage to two cell stage (pasa de
ser 1 célula a ser 2)
Morula
• Cells continue to divide
•Morula = ball of cells (is completed in day 4)
