Sentences with phrase «of a fertilized egg by»

Not exact matches

Much has been made about the claim made by Barr Pharmaceuticals that Plan B «may also prevent fertilization of a released egg (joining of sperm and egg) or attachment of a fertilized egg to the uterus (implantation).»

Leaders at the religious institutions assert that pills like ella and Plan B prevent pregnancy by blocking the implantation of a fertilized egg.

And for an interesting look at the problem of categorizing the pill as an abortifacient, check out Libby Anne's piece on the topic, where she notes that «if your goal is to save «unborn babies,» and if you truly believe that a zygote — a fertilized egg — has the same value and worth as you or I — the only responsible thing to do is to put every sexually active woman on the pill,» because the pill actually reduces the number of zygotes naturally rejected by a woman's body.

In like fashions of an egg being fertilized by a sperm might not a universe enter into another cosmos of the celestial varieties?

Since there is no soul to worry about then it is a matter of deciding when a fertilized egg should be given its own rights as a human and that line has been drawn by the courts at viability outside the womb which from virtually every educated medical doctor will tell you is at around 20 - 22 weeks.

(This can be complicated by the fact that some birth control pills prevent implantation of a fertilized egg.

Treatments like fertility drugs primarily increase a person's odds of giving birth to fraternal twins (two eggs fertilized by two sperms).

The couple uses donor sperm, and the egg, either provided by one of the women or by a donor, is fertilized in our state - of - the - art IVF laboratory.

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.

Fraternal twins — the most common kind of twins — occur when two separate eggs are fertilized by two different sperm.

Progesterone also helps prepare the lining of the uterus to receive the egg if it becomes fertilized by a sperm.

One of the earliest signs of pregnancy is light spotting which is caused by the fertilized egg attaching itself to the uterus wall after conception.

The right side of the illustration shows dizygotic twinning, in which each of two eggs is fertilized by a sperm and two zygotes are formed, each maturing into a twin.

Dizygotic twins (often referred to as fraternal), are the result of two eggs fertilized by two separate sperm.

ECPs are a regimen of hormone pills that can prevent pregnancy after unprotected intercourse by temporarily blocking ovulation, interfering with fertilization, or thinning the lining of the uterus to keep a fertilized egg from becoming implanted.

Once it reaches the end of the tube, the egg can be fertilized by sperm.

The egg is fertilized by a sperm then implanted in the in the lining of the uterus to develop to placenta and embryo, and later to fetus.

This delay benefits the male by assuring more of his sperm fertilize her eggs.

That ensures that all of the chewee's eggs were fertilized by chewer, who is free to mate with more slugs and spread its sperm farther and wider.

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.

«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.»

«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.

Is methylation transmitted directly through the fertilized egg, or is each infant born pure, a methylated virgin, with the attachments of methyl groups slathered on solely by parents after birth?

In fact, it confers an ad vant age to infected females by killing the eggs of uninfected females fertilized by an infected male.

Once the transfer was complete, the recipient eggs contained a complete set of genes, just as they would if they had been fertilized by sperm.

That hunk of DNA was supposed to be a template that the fertilized egg could use to repair the breach made by Cas9.

Twins are normally either identical — the result of a single sperm fertilizing a single egg, which then splits and duplicates itself — or fraternal, developing from two separate eggs fertilized by two separate 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.

Taken the morning after unprotected intercourse, levonorgestrel prevents a fertilized egg from sticking to the uterine wall and can cut the chance of pregnancy by 85 percent.

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?

As part of these ongoing research activities, the DNA of Dravet patients without SCN1A mutations was analyzed by trio exome sequencing, which searches across the active parts of the genome for de novo mutations that have arisen in these patients (de novo mutations are DNA copying errors that occur in the parents» gametes or in the fertilized egg or embryo, resulting in the afflicted family member being the first person in their family to have this genetic condition).

To do so, a team led by neuroscientist David Holtzman of Washington University in St. Louis injected genes for human apoE3 or apoE4, which is about a third as common, into fertilized mouse eggs.

If fertilized, the egg grows in place, supporting itself via placental tissues that eat into the wall of the tube and by releasing chemicals that stimulate the formation of new blood vessels.

He tried fertilizing a mouse egg by injecting genetic material from another female mouse, but it didn't work: None of the mice without any male genes developed to term.

Attracted by the «big questions» of how an organism grows from a fertilized egg into a creature with specialized body parts, he did a 3 - year postdoc with Harvard biophysicist Walter Gilbert, already a Nobel laureate, and neurobiologist H. Robert Horvitz at the Massachusetts Institute of Technology, who just won his Nobel Prize this month.

The fertilized eggs, donated by 87 patients, were unsuitable for implantation as part of in vitro fertility therapy, because they contained an extra set of chromosomes.

When gametes are expelled, sperm are attracted by a chemical cue and swim rapidly to one pole of the egg (bottom left) in order to fertilize it.

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.

Unlike the majority of fish in which females lay eggs that are later fertilized by males, live - bearers — which include species such as mollies, platies, guppies, swordtails and mosquitofish — have internal fertilization.

By culling and fertilizing eggs from only older females for many generations, Michael Rose of the University of California at Irvine managed to double his flies» life span.

Sources familiar with the new work from Mitalipov's group told the MIT Technology Review that they had produced tens of successfully edited embryos, and had avoided the issue of mosaicism by injecting eggs with CRISPR right as they were fertilized with donor sperm.

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.

In the case of zebrafish, less than 20 percent of fish produced by injecting DNA into fertilized eggs will transmit the foreign gene to the next generation.

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 placenta.

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.

Biologists have long wondered about the process by which descendants of a single fertilized egg specialize — or differentiate — to construct an adult animal.

These apps use a form of NFP called the rhythm method, which works by predicting ovulation, the time of the month when an egg is available to be fertilized.

All human beings develop from a single cell, which is a female egg cell fertilized by a spermatozoid, thus combining the genes of both the mother and father.

This is that point in the middle of your cycle when high estrogen and rising progesterone levels prompt an egg to be released from your ovary and travel down the fallopian tube, where it waits to be fertilized by sperm.