Homework Answers
a) Size of sperm cell is ~ 50μm which is almos 10000 times smaller than the egg cell which is having a diameter og 0.12mm approx.
b) Unfertilized cells are haploid in nature
c) Fertilized eggs becomes diploid in nature after fertilization
d) There is the presence of the sperm head within the fertilized oocyte and the gelatinous envelope of the oocyte vanishes as the sperm acrosomal enzymes dissolve it. The fertilized cell gets implanted in the uterus which the unfertilized cell cannot do.
e)The change in appearance is due to the sperm head that contains the acrosomal enzymes
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3. Draw and label the following stages of animal embryonic development, and indicate whether cells at each stage are haploid or diploid: sperm and egg, zygote, 4-cell stage, blastula, gastrula nu lla Spermlegg zugote Acell stave
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