Zygote - Wikipedia
Gamete, Zygote. Developed by the process of meiosis, Formed by the fusion of two gametes. A haploid cell that contains 23 chromosomes. Human zygotes contain 46 chromosomes. The type of cell division that produces gametes with half the normal chromosome number is called meiosis. Gametes. Gametes are reproductive cells that unite at fertilization to form a new cell called a zygote. Gametes are haploid cells formed by meiosis.
This delivery, or fertilization, occurs within the female's uterine tubes, usually within 24 hours after ovulation. By that time, the oocyte has traveled a few centimeters down the uterine tube towards the uterus, while the sperm have made the long trek from the vagina, through the uterus and into the uterine tube.
Did you know that sperm move about That may not seem like a lot to you, but to a cell that's so tiny it's not visible to the naked eye, that's a lot of ground to cover! And it's not an easy trip. Of the almost million sperm that are released by the average male, only a few thousand actually reach the uterine tube, and from that only a few hundred actually reach the egg. Talk about survival of the fittest! This trip through the female's reproductive tract can take as long as a few hours or as little as 30 minutes, depending on the environment within the female's uterus.Sperm and Eggs Cells - Biology for All - FuseSchool
That's a lot of swimming for those tiny sperm! And, after all that, they still have a lot of work to do if they want to fertilize the egg.
The three layers of the oocyte You see, when the oocyte leaves the ovary it is surrounded by a couple of different layers. A gamete has only 1 sex chromosome Y or X and 1 copy of autosomes.
After two gametes successfully unite, the chromosomes of each gamete combine, which explains why a zygote carries 2 sex chromosomes XY or XX and 2 copies of autosomes. Site Gametes exist in two types: While the male gamete is located in the testis, the female gamete is developed in the ovary. A zygote, on the other hand, is only found in the female reproductive system.
Fertilization terminology: gametes, zygotes, haploid, diploid
To be specific, a zygote is initially developed in the fallopian tube. Motility There are major differences between a gamete and a zygote in terms of mobility.
A male gamete or a sperm cell is motile in nature, and it can travel and reach the fallopian tube within 45 minutes. Unlike a male gamete, a female gamete egg cell and a zygote are both non-motile.
Difference between a Gamete and a Zygote
Shape A female gamete and a zygote bear close resemblance as they are both large and spherical, while a male gamete is a tadpole-like structure that has the ability to swim towards the fallopian tube. So that's it's nucleus, once again none of this is drawn to scale. And your mother is also going to contribute 23 chromosomes. So one, two, three, four, five, six, seven, eight, nine, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22 and then she will contribute an x chromosome for the sex determining so your sex determining chromosomes are going to be xy, you're going to be male, if this was xx, you're going to be female so this is also a gamete here.
So a gamete is the general term for either a sperm or an egg.
Fertilization terminology: gametes, zygotes, haploid, diploid (video) | Khan Academy
Now once these two things are fused, what do we have? Once they're fused, then we're going to have you could say a fertilized egg but we are going to call that a zygote so let me draw that. I'm going to do this in a new color, and I'm running out of space and I want this all to fit on the same screen so I'll draw it not quite at scale and so let me draw the nucleus of the zygote, I'm going to make the nucleus fairly large so that we can focus on the chromosomes in it, once again none of this is drawn to scale.
So you're going to have the 23 chromosomes from your father, so let me do that. One, two, three, four, five, six, seven, eight, nine, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22 and 23, and then the 23 chromosomes from your mother. One, two, three, four, five, six, seven, eight, nine, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22 and 23 so you got that x chromosome from your mother.
And as you might have notice, I've drawn them in pairs so you now have a total, let me make it clear, you have 23 chromosomes here, 23 chromosomes in the sperm, you have 23 chromosomes in the egg and now you have 46 chromosomes in the fertilized egg, 46 chromosomes, and now that we have a full contingent of chromosomes and then this cell can now keep replicating, keep splitting and differentiating into all of what makes you, you, we call this right over here, we call this a zygote.
- Gametes: Definition, Formation & Fusion
- Fertilization and Zygote Formation: Definition and Processes
So one way to think about it, the gametes are the sex cells that have half the number of chromosomes and the zygote is the cell that's now ready to differentiate into an actual organism that has double the number or that has a full contingency of chromosomes, that has 46 chromosomes, and you see that I've made them in pairs and these pairs, we call these homologous pairs and in each of these pairs, this is a pair of homologous chromosomes.
So what does that mean? Well that means that in general, these two chromosomes, you got one from your father, one from your mother, they code for the same things, they code for the same proteins but there are different variants of how they code for those proteins, those traits that you have so gross oversimplification is, let's say that there is a gene on, that one from your father that helps code for hair color well there would be a similar, there would be another variant of that gene on the chromosome from your mother that helps code for hair color as well.