Sentences with phrase «eggs during fertilization»

Developmental biologist Gary Wessel and colleagues at Brown University in Providence, Rhode Island, found the answer by studying sea urchin eggs during fertilization.

Shortly after a sperm penetrates an egg during fertilization, the sperm's mitochondria are degraded while the egg's mitochondria persist.

Not exact matches

The second question has in fact two facets: (a) how does it arise in the development of the individual organism during the process of growth from the moment of fertilization of the egg; and (b) how does the egg itself come to get that way — that is to say, how can we conceive of evolution as having «designed» the cell?

Some groups consider conception is the fertilization of the ovum / egg into a zygote during the first day or two after insemination.

Because of this limitation, researchers have theorized that inherited methylation, also referred to as parental imprinting, largely remains stable throughout development, except during two important developmental milestones: after fertilization and during the creation of sperm and egg cells.

The use of hormones and medications to overstimulate the ovaries to release multiple eggs during in vitro fertilization is thought to create a potentially harmful environment for implantation, especially in women with PCOS, Legro said.

In sperm and eggs, these double sets are halved to produce single, «haploid» ones, which unite during fertilization.

An international team of researchers from Japan and the UK has discovered how a single protein, called PP4, oversees the processing of DNA during sperm and egg generation for successful fertilization.

Although the statistics on the failure rate of human fertilization are not entirely robust, given the biological and ethical delicacy of conducting research in this area, the numbers consistently suggest that, at minimum, two - thirds of all human eggs fertilized during normal conception either fail to implant at the end of the first week or later spontaneously abort.

However, during normal fertilization, when an egg and a sperm fuse, the sperm's mitochondria are destroyed, as the embryo inherits only its mother's mitochondria.

Soon after the egg and sperm join during fertilization, the resultant zygote (fertilized egg cell) starts undergoing cell division.

Sperm cells can not divide and have a limited life span, but after fusion with egg cells during fertilization, a totipotent zygote is formed with the potential to develop into a new organism.

Simple things such as what to eat, what to drink, how to dress, stress level, or how much to sleep can drastically affect egg quality during its 85 - day journey to maturation, likelihood of successful fertilization, as well as the subsequent implantation and development.