Well, I kind of lucked out looking for this video while I was actually looking for a video of some swimming sperm! (Lucky me)! Anyway, the video contained the basic information covering objectives 76 and 77, but I think that objective 74 can be fit nicely in here as well, so here goes! The video gave a step by step starting from the time that the zygote had actually implanted itself in the endometrium lining of the uterus wall. HERES THE THING: What it did not mention is what a zygote is. A zygote is actually two haploid sex cells fused together to form a diploid cell that will hopefully someday become a baby. This goes back to Bio-100 again, where we studied our genetic makeup. So this is how that works, it actually takes a full 46 chromosomes to make a human being. When the gametes or sex cells are produced during meiosis, they are produced with only 23 chromosomes. This way when the two gametes (the sperm and the ova or egg) join together, the future fetus that they produce will have genetic characteristics from both parents.
So in brief, a haploid cell has 23 chromosomes (think Haploid = Half), where as a diploid cell has a full 46 chromosomes (think Diploid = Double)!
To talk just a little bit more about this, I again refer back to the iconic Bio-100! I specifically remember Mrs. Gess using her hands to form a ball (a morula, the ball of divided cells)) and then beginning to move her hands inward to form the blastocyst....a tube within a tube.
Even more amazing after learning this information is that that zygote which then becomes the morula and then becomes a blastocyst then becomes:
This fetus ......
who then becomes....this baby...
who then becomes....this little girl.
~ Aubrey Grayson Kersey ~
When you look at it from that perspective, its awe inducing~
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