Sentences with phrase «development of the fertilized egg»

In this study, Dr. Yasuoka prepared the so - called «head organizer co.cktail» comprised of several proteins required for head formation during early development of a fertilized egg and introduced it into a frog embryo.

Theists quite properly see the hand of God at work in major evolutionary changes such as the origin of life, but also in such everyday occurrences as the development of a fertilized egg into a cocker pup, and too in the social turmoil — including very real moral and physical evil — that accompanies economic, technological, and intellectual change.

Breast and prostatic cancer incidence increased between 1969 and 1986; there was a four-fold increase in ectopic pregnancies (development of the fertilized egg outside of the uterus) in the U.S. between 1970 and 1987; the incidence of cryptorchidism (undescended testicles) doubled in the U.K. between 1960 and the mid 1980s; and there was an approximately 42 % decrease in sperm count worldwide between 1940 and 1990.

Not exact matches

The emergence of mind in the course of individual development from the fertilized egg presents a similar problem and one that is an everyday occurrence instead of a single event in the remote past.

«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.

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.

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.

This method involves removing the freshly fertilized nucleus from an egg that has little chance of further development because of age or disease and injecting it into the donor egg.

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.

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.

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 results also provide insight into the biology and development of chicken embryos in fertilized and incubated eggs.

He and his colleagues therefore used CRISPR to knock out, in fertilized mouse eggs, at least one gene crucial for the development of a particular organ, like the heart.