Study

Fertilization

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  • What cellular process is required for a single celled Zygote to become a multicelled embryo?o?
    Mitosis. Mitotic Division. Cleavage. All three are acceptable answers.
  • Once a sperm has fertilized an egg the resulting single cell is called _______.
    a Zygote
  • What happens when the sperm that "won the race" enters the perivitelline space?
    Chemical reactions will occur that harden the zona pellucida and prevent any other sperm from entering the egg.
  • Diploid means _________________.
    You have ALL the chromosomes needed to be a particular organism.
  • In human beings, Chromosome sets 1-22 are considered to be __________.
    Autosomes which are chromosomes that are NOT sex chromosomes.
  • The acrosomal reaction ________________.
    allows enzymes in the sperm to digest away the fatty layers of the egg so it can get inside the egg.
  • Polyspermy is defined as ___________ and it is typically ___________.
    Polyspermy is more than one sperm fertilizing the same egg. This condition is typically lethal.
  • After several mitotic divisions, a Zygote that now has 16 to 32 cells in a solid ball will be known as ___________.
    a Morula
  • The second layer, in a fertilized egg, that sperm must penetrate is known as the __________.
    zona pellucida
  • Do unfertilized eggs have a diploid number of chromosomes along with mitochondria, ribosomes, SEM, RER, and Golgi Bodies?
    No! Unfertilized eggs will have the HAPLOID number of chromosomes along with all those mentioned organelles.
  • Which of the following are ions that will harden the zona pellucida after they are released? Na+? Cl-? Ca2+? O2-?
    Na+ (Sodium ions) and Ca2+ (calcium ions) will depolarize and harden the zona pellucida.
  • ***** are _________ because they contain _____________.
    haploid / half the DNA = gametes / one set of chromosomes
  • In human beings, the 23rd set of chromosomes are considered to be __________
    The X and Y chromosomes or the *** Chromosomes
  • What is the correct order of embryonic development in a human starting from a fertilized egg?
    Fertilized Egg / Zygote / Morula / Blastocyst / Embryo
  • Haploid means ________________.
    You have only HALF the chromosomes needed to be a particular organism.
  • After several mitotic divisions, a fertilized egg that has developed a fluid filled cavity inside a layer of several cells is __________.
    a Blastocyst
  • The first layer of the unfertilized egg that a sperm will have to penetrate is known as the _______________.
    corona radiata
  • Which layer of an unfertilized egg will have receptor proteins that a sperm needs to dock with in order to continue into the egg?
    the zona pellucida