Sentences with phrase «egg cells first»

Xi says part of the trick is to suck a minuscule amount of cytoplasm out of egg cells first to make room for the injected bacteria and prevent cells from bursting.

But the whiptails» egg cells first double their chromosomes twice and then divide twice, leaving them with the normal number of chromosomes and rendering a sperm cell unnecessary.

Not exact matches

That physical, chemical development, from a simple egg to a complex animal, in many ways is a bigger leap than the first leap from a chemical soup to the first cell.

The first page of Larsen's Human Embryology states that, `... [W] e begin our description of the developing human with the formation and differentiation of the male and female sex cells or gametes [sperm and egg], which will unite at fertilisation to initiate the embryonic development of a new individual».

The first thing the egg cell does is to begin dividing into many cells.

For example in the fruit fly the first difference between the front and back end of the egg is caused by the cells of the mother's ovary, external to the egg, that release at the anterior end a specific chemical which then diffuses backwards, giving rise to a chemical gradient of concentration.

Asexual whiptails have a special trick for making spermless reproduction work: The egg cells in other animals first double their choromosomes once and then divide twice, leaving them as haploid cells, with half the normal number of genetic material.

Fertile eggs have been created from mouse skin cells for the first time, raising the prospect of new fertility treatments and babies with two genetic fathers

For the first time, researchers have made something resembling a mouse embryo without using an egg cell, allowing them to probe the early steps of development

In 2007, however, scientists at International Stem Cell, a California - based biotech firm, reported the first successful creation of human stem cell lines from unfertilized eCell, a California - based biotech firm, reported the first successful creation of human stem cell lines from unfertilized ecell lines from unfertilized eggs.

The first complete, real - time recording of an egg cell eliminating its centrioles shows the starfish egg cell handles mature «mother» centrioles (green) differently from immature «daughter» centrioles (purple).

Jonathan Tilly and colleagues at Massachusetts General Hospital in Boston first challenged the idea that mammals are born with a limited supply of eggs back in 2004, when they found evidence for ovarian stem cells in...

Fraudulent cloned cells were likely the first example of a human egg turned directly into stem cells

Using a powerful microscope to observe mouse oocytes as they split, Ellenberg's group found that the spindles assembled into two coherent structures, one for the future egg and one for the future polar body.At first, spindles appeared throughout the cell in a sort of mesh.

It was 1996 when biologists first fused a mammalian skin cell with an egg cell, cloning Dolly the sheep.

In 1957, developmental biologists first discovered that they could insert the nucleus of adult frog cells into frog eggs and create dozens of genetically identical tadpoles.

For some reason their eggs contain the same 44 chromosomes as their body cells — 22 from the mother and 22 from the father — instead of half, and so the eggs can grow into gecko hatchlings without first being fertilized by sperm.

«When the sperm enters the egg cell, the densely compacted male chromatin has to be entirely «unpacked» and restructured around protein scaffolds called histones,» explained Sabrina Ladstätter, first author of the study.

In an advance that could lead to new fertility treatments, researchers have coaxed immature human egg cells to fully develop in the lab for the first time.

Egg and sperm - like cells have recently been derived from animal stem cells, and this year the first mice were born from lab - grown sperm.

To determine the most common type of age - related segregation errors, the researchers first used a novel high resolution imaging technique to visualize chromosomes in live mouse egg cells throughout the whole first stage of meiosis.

In May 2006, Eggan's lab received approval from Harvard to seek healthy human eggs from female donors, a first step toward using research cloning to create new stem cell lines.

In June Italian scientists announced the first human embryonic stem cells derived from parthenotes — embryo - like structures formed when an egg starts to divide on its own, with no sperm involved.

Although the researchers had first removed the DNA of both the egg and the fertilizing sperm, the egg was still primed for cell division and development, increasing the chances of success, the team says.

In the first cell cycle after fertilization the maternal genome inherited from the oocyte (egg) and the paternal genome provided by sperm exist as separate nuclei in the zygote.

The new finding brings a measure of closure to a story that first rocked the science world in February 2004, when Hwang and colleagues at Seoul National University announced they had cloned a female donor's cell by transferring its nucleus into one of her egg cells stripped of its nucleus in a procedure known as somatic cell nuclear transfer (SCNT), and harvested embryonic stem cells from the resulting fusion.

At first, this causes disease and death, but over thousands of years of repeated infection, resistance to the virus evolves, allowing any viral DNA that has embedded itself into sperm or egg cells to be passed on to the next generation.

The group succeeded in visualizing for the first time, how the cytoskeleton of plant egg cells is disassembled after fertilization and then reorganized to create a polarity in the cell that eventually leads to asymmetric cell division.

The fertilized egg cell (zygote), which is the origin for plants, establishes the plant's body axis from its first cell division.

In a world - wide first, Chinese scientists cloned two monkeys by transplanting donor cells into eggs, they said on Wednesday, a feat that could lead to genetically engineered primates for drug testing, gene editing and brain research.

In 1996 researchers in Scotland used SCNT to transplant the nucleus of an adult sheep cell into an enucleated sheep egg, producing Dolly, the first cloned mammal.

While cloning has been deemed virtually impossible for many reasons, a team of researchers based at Texas A&M University were able to successfully complete the first step towards cloning: the removal of the egg cell's nucleus (enucleation) 1.

These egg cells are produced in the first fetal stages of our lives and then subsequently «rest», sometimes for as long as 45 years, until they are activated.

During this phase, the egg cell stays in the fallopian for the first 12 - 24 hours.

Other companies such as Hampton Creek are working to also make this a reality for humans; the brand, which just released a first - of - its - kind eggless scrambled egg, is in the early stages of introducing cell - cultured meat and seafood products.