18 Questions
What is the fertilization membrane made up of?
Chorion and vitelline membrane
What is the fate of the blastocoel at the end of gastrulation?
It is obliterated
What determines the stage of the embryo in early cleavage stages?
Number of cells
What is characteristic of a Morula stage embryo?
16-32 cells resembling a mulberry
What secretes the fertilization membrane in the ovary?
Follicle cells
What is distinctive about the gastrula stage?
Open cavity formed by invagination
Where does fertilization occur in Ascaris females?
Uterus
What is the diploid number in Ascaris?
2n=4
What is the result of fertilization in animal cells?
Cleavage and gastrulation
What part of the female reproductive tract in Ascaris enlarges to form the uterus?
Ovary
How do Ascaris reproduce?
Sexually with separate sexes (dioecious)
Where do sperm cells enter the eggs during copulation in Ascaris females?
Oviduct
What is the primary difference between the primary oocyte and the fertilized egg?
Presence of sperm head inside the egg
What is the characteristic feature of the pronuclear stage?
Separation of homologous pairs
What is the role of the male pronucleus in fertilization?
Generates an array of microtubules
Which structure transforms into a pronuclei during fertilization?
Sperm head chromosome
What is the main function of the fertilization membrane?
Envelops the first polar body
At what stage does the nucleus of the ovum transform into the female pronucleus?
Pronuclear stage
Learn about the process of fertilization in animal cells, which involves the direct interaction and fusion of egg and spermatozoan cells. This process initiates cleavage, gastrulation, and the species-specific developmental program.
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