Log in viague24 3 years agoPosted 3 years ago. Direct link to viague24's post “So what happends differen...” So what happends differently in the fertilization cycle when a woman has twins? • (5 votes) Yaelle 3 years agoPosted 3 years ago. Direct link to Yaelle's post “Two situations can happen...” Two situations can happen : (19 votes) JaNea campbell 4 years agoPosted 4 years ago. Direct link to JaNea campbell's post “Human life begins with a ...” Human life begins with a single cell. Over the course of 9 months, this cell becomes trillions of cells. What process is responsible for this? • (8 votes) sahasra 3 years agoPosted 3 years ago. Direct link to sahasra's post “Mitosis, mainly. There's ...” Mitosis, mainly. There's an article on Khan Academy showing this process: https://www.khanacademy.org/science/ap-biology/cell-communication-and-cell-cycle/cell-cycle/a/phases-of-mitosis phiritshepiso32 3 years agoPosted 3 years ago. Direct link to phiritshepiso32's post “does a female not undergo...” does a female not undergo menstruation throughout the whole pregnancy • (5 votes) Lorelei a year agoPosted a year ago. Direct link to Lorelei's post “Yes, because the part of ...” Yes, because the part of menstruation that is "bleeding" is when a female sheds the lining of their uterus. So when the zygote, blastocyst, embryo, or fetus is inside the uterus. It relies on the uterus to develop a placenta and provide food, so it can not shed if that makes sense. (7 votes) Mary James 3 years agoPosted 3 years ago. Direct link to Mary James's post “when does the heart start...” when does the heart start beating? • (5 votes) Adira Moore 3 years agoPosted 3 years ago. Direct link to Adira Moore's post “It depends on the animal....” It depends on the animal. For a human the hearts beating at 21-23 days in the fetus. (6 votes) 001303405 2 years agoPosted 2 years ago. Direct link to 001303405's post “Is apoptosis a mechanism ...” Is apoptosis a mechanism for cell differentiation? • (4 votes) mflores5 2 years agoPosted 2 years ago. Direct link to mflores5's post “Is Human Development and ...” Is Human Development and Vertebrate Development the same? • (4 votes) 🤩 4 years agoPosted 4 years ago. Direct link to 🤩's post “How does sexual reproduct...” How does sexual reproduction in plants differ from asexual reproduction in plants? • (3 votes) ez24 4 years agoPosted 4 years ago. Direct link to ez24's post “It differs just like it w...” It differs just like it would with animals or other organisms. In sexual reproduction, a male gamete fuses with a female gamete to form a zygote (requiring two parents, leading to more genetic variation, etc). In asexual reproduction, the organism essentially copies itself (one parent, very limited genetic variation). In plants, sexual reproduction looks like pollen, seeds, and plant ovules. An example of asexual reproduction would be where cuttings of plants form roots after being placed in water. (3 votes) Invincible_DuckRider 6 years agoPosted 6 years ago. Direct link to Invincible_DuckRider's post “Can necrosis be a program...” Can necrosis be a programmed cell death in certain cases? • (3 votes) Itajá Júnior 6 years agoPosted 6 years ago. Direct link to Itajá Júnior's post “Yes. There's been a recen...” Yes. There's been a recent discovery of a process called "Necroptosis", which, as you guessed, is regulated or programmed necrosis. Because it's a recent discovery and most research has focused on "how necroptosis happens", there's still a lot of research pending on "why necroptosis happens." A hypothesis (i.e. a plausible idea still not validated by research) is that necroptosis may be used as a mechanism to induce or amplify an inflamatory response. (2 votes) Elisabeth Szeto 5 years agoPosted 5 years ago. Direct link to Elisabeth Szeto's post “What does the processes o...” What does the processes of fertilization not use? • (2 votes) Cancerscello 4 years agoPosted 4 years ago. Direct link to Cancerscello's post “it uses everything, can y...” it uses everything, can you be more specific of exactly what you mean? (3 votes) layaz7717 4 years agoPosted 4 years ago. Direct link to layaz7717's post “In people with syndactly,...” In people with syndactly, does this apoptosis just not happen properly? What about polydactyly? • (2 votes) Lorelei a year agoPosted a year ago. Direct link to Lorelei's post “It may have something to ...” It may have something to do with specific homeobox genes like hox genes and the order in which an organism develops within the uterus, egg, etc. (2 votes)Want to join the conversation?
- in the case of identical twins, the ovaries of the woman release one egg during ovulation, and once this egg gets fertilized it divides once too much, forms twice the amount of cells it was supposed to, and boom you've got two identical bundles of cells that will be the two children. Identical twins share the exact same genes as they come from the exact same egg fertilized by the exact same sperm cell.
- in the case of non-identical twins : sometimes a woman's ovaries can release not one but two eggs during the same cycle. If those two eggs get fertilized by two different sperm cells at around the same time, then you've got two embryos that will be non-identical twins (not sharing the same genome because they come from two different eggs and two different sperm cells).
Hope this helped !
