Sentences with phrase «of fertilized egg cells»

The «pro-life» literature is mostly a string of verbally implied identifications of fertilized egg cell with fetus, of fetus with infant, infant with child, child with youth, yotith with adult.

Not exact matches

This term refers to everything from a newly fertilized single - celled egg to millions of cells organized into eyelids, ears, genitals, and limbs.

RU - 486, which is not for sale in the U.S., blocks cells in the uterus from receiving the natural hormone progesterone, the function of which is to prepare the lining of the uterus to receive and sustain a fertilized egg.

A clump of cells with no brain, and no neural tube is no more «a human life» than cells from your skin layer, or a sperm cell with no change of fertilizing an egg.

A fertilized human egg cell does not contain a homunculus, but neither is it a structureless drop of viscous liquid.

From single - cell fertilized egg to baby to teenager to adult to old age to death is a single process of one individual, not a series of different individuals replacing each other.

Hartshorne has no patience for those holding a genetic view of personhood, who claim that the potential represented in a fertilized human egg cell is equivalent to an actual person.

The DNA in the nucleus of the fertilized egg contains all the instructions needed to make all the different proteins and all the different sorts of structures in all the different sorts of cells in the body.

Implantation Bleeding: This is when you have released an egg and it has been fertilized by a sperm, making a bundle of cells known as a zygote.

Conjoined twins form when your fertilized egg does not split completely into two separate balls of cells.

Meanwhile, seven or eight days after a sperm fertilizes an egg in week 4 of pregnancy, a mass of cells — the earliest form of an embryo — implants into the wall of the uterus.

They made these clones by a process called automatic parthenogenesis: The egg is formed normally (with half the species» usual number of chromosomes), then fertilized by the «polar body,» a cell that is created during oogenesis and contains the same gene copies as the egg, resulting in the shark having half the genetic variation of its mother.

But understanding the precisely orchestrated choreography that unfolds within each egg during cell division will eventually allow us to correct the errors, to ensure the production of healthy eggs that can be fertilized.

«Ladies, this is why fertility declines with age: Age - related female infertility explained by a defect in the choreography of chromosome sharing during cell division in eggs before they are fertilized.»

The film depicts several sperm attempting to fertilize the egg, «zooms in» on one sperm's tail to show how the dynein proteins move in sync to cause the tail to bend and flex, and ends with the sperm's successful journey into the egg and the initiation of cell division that will ultimately create a new organism.

«If gdf3 is not supplied to the egg by the mother, the fertilized egg can not produce two of the three major types of cells required for development,» Burdine said.

The method, called somatic cell nuclear transfer (SCNT), replaces the DNA in an egg cell's nucleus with the genetic material from the nucleus of a skin cell, then tricks the egg cell to start dividing as if it had been fertilized with sperm.

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.

Somehow, scientists know, the genes that control development — generally turned off in adult cells — get turned back on again by the oocyte, enabling the cell to take on the youthful potential of a newly fertilized egg.

For instance, cells from a man's skin could theoretically be used to create eggs that are fertilized with a partner's sperm, then nurtured in the womb of a surrogate.

Another possibility is harvesting cells from an egg that is stimulated to divide as if it were fertilized; the resulting cells, lacking half the usual genes, could be closely matched to a wide variety of recipients.

How can you have a meeting with people who come to it with a deep abiding faith that a fertilized egg is a person, and a blastocyst created by nuclear transfer is a person, and the destruction of that blastocyst to harvest stem cells is murder?

But like the medieval alchemists, today's cloning and stem cell biologists are working largely with processes they don't fully understand: What actually happens inside the oocyte to reprogram the nucleus is still a mystery, and scientists have a lot to learn before they can direct a cell's differentiation as smoothly as nature's program of development does every time fertilized egg gives rise to the multiple cell types that make up a live baby.

In embryos, they guide differentiation from the single fertilized egg into all cells that form the different tissues and structures of the body.

Before most plants can make seeds, pollen must navigate the specialized portal of a flower and fertilize an egg cell at the end.

Every embryo begins as a single fertilized egg, which develops into a human body consisting of trillions of cells, each one specialized to carry out specific functions.

Even though the reproductive age for humans is around 15 — 45 years old, the precursor cells that go on to produce human eggs or sperm are formed much earlier, when the fertilized egg grows into a tiny ball of cells in the mother's womb.

«Maybe at the one - cell or two - cell stage,» Eggan and his colleagues reasoned, «there's still some of that stuff in there...» And if they picked the right moment of cell division, when these powerful reprogramming factors were still floating around in the periphery of the cell, they might be able to use drugs to temporarily freeze the cell in the middle of division, stick in the needle of a micromanipulator to suck out the embryonic DNA, squirt in DNA from an adult animal, and then kick - start the process of reprogramming — hours, perhaps even days after an egg had been fertilized.

It is at this stage, when the fertilized egg is smaller than the period at the end of this sentence, that researchers extract the inner part of the blastocyst, from which embryonic stem cells are derived.

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.

All the potential of embryonic stem cells might be harnessed with the new techniques — without the political and moral controversy associated with destroying a fertilized egg.

The pollen tube (stained blue) penetrates deep enough to reach and fertilize local egg cells (arrows)-- the beginning of the process by which they become seeds.

And indeed, as more of the eggs filled the screen of the monitor — some fertilized, most not — the cells frequently had large vacuoles, or fluid - filled bubbles, in their interior.

If you imagine the female egg cell (and later, the fertilized egg) as a spherical planet with its own intrinsic biological geography, then certain characteristics of that cell — the location of protein molecules or RNA messages or biochemical traits like pH or even the internal connective structures called microtubules — will be more prominent in certain regions, like one hemisphere as opposed to the other, or near the surface rather than near the core.

Researchers from the University of California, Berkeley, have found a way to reprogram mouse embryonic stem cells so that they exhibit developmental characteristics resembling those of fertilized eggs, or zygotes.

The ability of a fertilized egg to generate both embryonic and extra-embryonic tissues is referred to as «totipotency,» an ultimate stem cell state seen only during the earliest stages of embryonic development.

Newly fertilized eggs before gene editing (left) and embryos after gene editing and a few rounds of cell division (right).

If the cells can be fertilized and develop into viable embryos, and if human ES cells turn out to have similar powers, such cells could allow researchers to get around some of the expense and ethical questions that arise from using donated eggs for therapeutic cloning experiments.

(A fertilized egg is the classic example of a totipotent cell.)

Embryonic development in mammals begins with the division of the fertilized egg, which is then followed by several further rounds of division to form the blastocyst, a sphere of cells made up of two layers of cells surrounding a fluid - filled cavity.

The researchers then injected the nucleus of an egg from a second macaque, fertilized the cell with sperm, and implanted it in the second monkey's womb.

Every one of us began as a single cell, a fertilized egg that produced the complex layers of tissue that make up our bodies.

testes (singular: testis) Organs in the males of many animal species that makes sperm, the reproductive cells that fertilize eggs.

In mammals, a single fertilized egg rapidly divides into several trillions of cells grouped into specialized tissues with marked differences in terms of developmental origin, regenerative capacity and ability to cope with damage.

The controversial little cells are really «hollow microscopic balls of cells» that come from a fertilized egg.

According to the National Institutes of Health, most embryonic stem cells come from eggs fertilized for in vitro treatments in a lab, not from eggs fertilized in a women's body.

We might be able to use stem cells to produce lots of new sperm and eggs and fertilize them to grow their population.

By manipulating a specific gene in a mouse blastocyst — the structure that develops from a fertilized egg but is not yet an actual embryo — scientists with the University of Florida's McKnight Brain Institute and the Harvard Stem Cell Institute caused cells destined to build an embryo to instead change direction and build the cell mass that leads to the placeCell Institute caused cells destined to build an embryo to instead change direction and build the cell mass that leads to the placecell mass that leads to the placenta.

To make the tissues, the scientists crack open fertilized chicken eggs, pull fibroblasts and muscle cells out of the embryos» hearts, and mix them together with collagen.

The human body comprises more than 200 types of cells, and every one of these cell types arises from the zygote, the single cell that forms when an egg is fertilized by a sperm.