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Aneuploid human embryos are least likely to survive except those involving?
Aneuploid human embryos are least likely to survive, except in cases involving trisomy 21 (Down syndrome). Trisomy 21 is the most common chromosomal disorder compatible with life, although it comes with its own set of health challenges.
Which female relative does a child share the most genes with: their mother, grandmother, or great-grandmother, or is it impossible to tell?
A child shares the most genes with their mother.
What is the most commonly used method of cloning?
The most commonly used method of cloning is called somatic cell nuclear transfer (SCNT). This involves transferring the nucleus of a somatic cell into an egg cell that has had its nucleus removed. The newly formed embryo can then be implanted into a surrogate mother to develop into a clone.
What is the most fascinating thing you have ever seen inside a cocoon?
Inside a cocoon, the most fascinating thing I have ever seen is the transformation of a caterpillar into a butterfly.
Implanting at 2 or 3 or 5 days How is this decided?
its decided by when you had sex..48 hours for the sperm to reach the egg..it takes 72 hours for implantation..24 hours for the egg to bury itself into the wall meaning the journey itself to get to the wall all together 24hrs..when you have sex everyday you are increasing you chances...
Do the majority of animal embryos develop inside the mother?
No, the majority of animal embryos develop outside the mother's body. This includes animals such as birds, reptiles, and most fish. Embryos that develop inside the mother's body are found in live-bearing mammals as well as some fish and sharks.
What does oviparous and viviparous animals mean?
Oviparous -- reproduction by eggs that develop outside the body -- birds, most reptiles Viviparous -- reproduction via live birth where offspring develop inside the mother's body -- human, most mammals
How many embryos do women have?
It has been reported that most women develop about 400 eggs in their ovaries by the time of menstruation. These wouldn't be embryos until they have been fertilized.
What would you call animals that lay eggs?
Monotremes- are mammals that lay eggs instead of giving birth to live young like marsupials and placental mammals Oviparous- animals are animals that lay eggs, with little or no other embryonic development within the mother. This is the reproductive method of most fish, amphibians and reptiles, all birds, the monotremes, and most insects and arachnids. Ovoviviparous- animals develop within eggs that remain within the mother's body up until they hatch or are about to hatch. This strategy of birth is known as ovoviviparity. It is similar to vivipary in that the embryo develops within the mother's body. Unlike the embryos of viviparous species, ovoviviparous embryos are nourished by the egg yolk rather than by the mother's body. However, the mother's body does provide gas exchange. Viviparous- is an animal employing vivipary: the embryo develops inside the body of the mother, as opposed to outside in an egg (ovipary). The mother then gives live birth.
Do reptiles lay eggs?
Most reptiles lay eggs, but some species do not. An couple of examples of the latter would be the garter snake or all boas and all vipers. The eggs are fertilized inside the mother then hatch inside the mother then are born alive.
Where do most mammals grow before they're born?
Most mammals are placental mammals: they develop in a placenta before birth. Marsupials also develop in a placenta, but they are delivered much earlier and the placenta is less developed. Monotremes develop within an egg, which is kept inside the mother for some time before it is laid. It hatches several days later.
Do stingrays lay eggs or do they do live births?
Most rays are ovoviviparous, bearing live young in "litters" of five to ten. The female holds the embryos in the womb without a placenta. Instead, the embryos absorb nutrients from a yolk sac, and after the sac is depleted the mother provides uterine milk
What are the animals who give birth to young ones by egg?
Among the mammals - monotremes Among birds - all of them Among fish - most of them Among reptiles - most of them Among insects - most of them Egg laying is common to all species of birds and most reptiles, though several species of snakes and lizards are viviparous. Most fish and amphibians are oviparous as well. Among mammals, only the platypus and four species of echidna lay eggs. There is a third mode of reproduction, called "ovovivipary" in which embryos develop inside eggs that are held within the mother's body, until they are ready to hatch. The scientific term for an animal that lays eggs is oviparous.
Do fish develop internally or externally?
Fish develop externally, meaning that fertilization and embryonic development occur outside of the parent fish's body. The eggs are often released into the water where fertilization takes place, and the embryos develop independently until they hatch.
Are snakes oviporis or viviporis?
Most are. Oviparous animals are those that lay eggs with little development taking place inside the mother's body. There are some species that are ovoviviparous, meaning that the eggs are essentially carried and hatched inside the mother, leading to her giving live birth. Rattlesnakes are ovoviviparous.
Where is it possible to learn about embryos?
There are quite a few sites where you can find information about pregnancy and embryos. One of the most trusted is webmd. Another one is called askthedoctor.
How does shark reproduction differ from the reproduction of most fishes?
Rather than lay eggs that are fertilized outside the mother, the eggs are fertilized inside the mother, and the baby sharks grow inside her until they are born.
