Sentences with phrase «fertilised egg cell»

The journey from a single fertilised egg cell through to a baby delivered crying into the arms of its mother is one of the most beautiful and complex processes to occur in nature.

A fertilised egg cell is the start of every human life.

Renee Reijo Pera's group at Stanford University in California filmed the development of 242 human zygotes — fertilised egg cells that have not yet divided.

Not exact matches

A chemical pregnancy (or as my doctor nicely termed it, a threatened abortion) basically means although an egg was fertilised, the clump of cells did not implant successfully, and the hormones triggered by implantation did not stop menstruation from happening.

It is where the fertilised egg is implanted after which the cells develop into a fetus and finally into a baby who will be born after nine months.

So in animals, before an egg cell is fertilised by a sperm, its centrioles are eliminated, ensuring that the resulting embryo receives only the sperm's centrioles.

«But if we make a mother centriole stay in the cell, it doesn't get destroyed, so the fertilised egg ends up with a tripolar spindle and can't divide.»

If a fertilised egg has centrioles from both the egg cell and the sperm, its genetic material will be pulled in too many directions and it will be shared unevenly between the resulting cells, which is likely to make the embryo unviable.

Fishel's team filmed 88 newly fertilised eggs from 69 couples in their incubator until they become blastocysts — the small ball of cells that is implanted into the womb.

The researchers believe the hammerhead shark reproduced by a type of asexual reproduction called automictic parthenogenesis, whereby an unfertilised egg is activated to behave as a normal fertilised egg by a small, nearly genetically identical cell known as the sister polar body.

«Before we get too excited about this being a new form of infertility treatment, these cells can not as yet be made into functioning sperm, so we have no idea if they can pass «the acid test» — the ability to fertilise female eggs as is achieved with donor sperm in IVF treatment,» says Malcolm Alison of the London School of Medicine and Dentistry in the UK.

But these fertilised eggs never progressed beyond the two - cell stage, well short of the eight - cell embryo needed for re-implantation.

In July 2006, biologist Karim Nayernia at the University of Newcastle - upon - Tyne in the UK, and colleagues reported they had successfully converted stem cells from mouse embryos into functioning sperm that could fertilise mouse eggs and produce live offspring.

The result would not be a clone because of the way cells divide during sexual reproduction — the fertilised egg would not be genetically identical to the original iPS cells — but it would be something very strange and dangerous.

Once fertilised, the egg cell becomes the embryo while the central cell becomes the endosperm that nourishes the embryo.

These are caused when an egg cell lacking a nucleus is fertilised by a sperm cell.

Those edited sperm cells where then used to fertilise the mother's eggs, cementing the change into all of his nuclear DNA.

When these cells were coaxed into forming sperm and used to fertilise eggs, 50 to 60 per cent of the resulting pregnancies led to live births (Science, doi.org/cbxt).

They transferred a treated nucleus into a cow egg cell, which was fertilised and implanted into another cow.

Sex cells — sperm and egg cells — have 23 single chromosomes each so that a paired set is created when a sperm fertilises an egg.

After the egg is fertilised, it divides until at about 7 days it forms a ball of around 200 cells called the «blastocyst».

When the sperm then fertilises a normal egg, a transgenic mouse is produced with the same foreign DNA in every cell.

Mike Gilchrist of the Crick (currently based at Mill Hill) explained: «Development is a complex process, generating a functional and correctly scaled organism from a single cell — the fertilised egg.

These corrosive influences result in progressive, subtle divergence of the DNA sequence in each cell from that originally constituted in the fertilised egg.

«Therefore there's a chance that the egg cells have been fertilised by sperm other than that of the intended father.»