Sentences with phrase «female egg cell»

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.

The female egg cell is a huge biochemical universe unto itself, with a complex and sophisticated cytoplasm.

There on the screen was the huge, rotund universe of the female egg cell, its internal jelly, or cytoplasm, smooth and evenly grained, and there, just below the equator, two ghostly yolklike circles around the male and female DNA, mere mirages of genetic material, in close proximity, nearly nuzzling.

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.

Not exact matches

Meanwhile, the February 2 issue of the New Scientist noted the work being done with stem cells to create «female sperm» and «male eggs.»

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».

Pairs of female whiptails sometimes engage in mock sex, which led to the nickname «lesbian lizards» and seems to encourage the production of egg cells.

Female mammals are born with millions of dormant eggs, but only a small fraction ever mature into cells with reproductive potential.

They diverged 200 million years ago, yet V. carteri produces eggs and sperm, while the sex cells of C. reinhardtii are similar in dimensions and can not be described as male and female.

«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.»

When female animals form egg cells inside their ovaries, they deposit messenger RNAs (mRNAs)-- a sort of genetic instruction set — in the egg cell cytoplasm.

By injecting specialized trout sex cells into sterilized but otherwise healthy salmon embryos, Japanese scientists wound up with male salmon that ejected trout milt (semen) and female salmon bearing trout eggs.

«Before we get too excited about this being a new form of infertility treatment, these cells can not as yet be made into functioning sperm, so we have no idea if they can pass «the acid test» — the ability to fertilise female eggs as is achieved with donor sperm in IVF treatment,» says Malcolm Alison of the London School of Medicine and Dentistry in the UK.

Saitou used iPS cells from male mice to create sperm and from female mice to create eggs, but he says that the reverse should be possible.

Some doubt, however, that such a feat would ever be possible — the Hinxton Group, an international consortium of scientists that discusses stem - cell ethics and challenges, concluded that it would be difficult to get eggs from male XY cells and sperm from female XX cells.

This little cluster goes on to form the tens of thousands of eggs that female mice have at birth, and the millions of sperm cells that males produce every day, and it will pass on the mouse's entire genetic heritage.

In humans and other mammals, the female reproductive cells — the eggs or oocytes — need nourishment in order to grow and remain fertile.

Dr Nadeau added «Our results are even more surprising because the cortex gene was previously thought to only be involved in producing egg cells in female insects, and is very similar to a gene that controls cell division in everything from yeast to humans.»

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.

Egg - cell of a female fruit fly with the egg cell in which H3K27me3 was made visible through green stainiEgg - cell of a female fruit fly with the egg cell in which H3K27me3 was made visible through green stainiegg cell in which H3K27me3 was made visible through green staining.

Because the cells that give rise to sperm divide frequently — about 23 times a year — they are much more likely to accumulate genetic copying errors than the female precursor cells, oocytes, which divide only twice before becoming eggs.

Hay's team also showed that the same approach could be used to make female mice generate antibodies to the zona pellucida, a layer of proteins that surrounds egg cells.

When germ cells are removed in medaka, XX (female) fish show female - to - male sex reversal, while XY (male) fish with excessive germ cells, which is usually associated with egg production, exhibit male - to - female sex reversal.

Egg cells can also be preserved in their hundreds of thousands by collecting ovarian tissue from reproductively active females that die in captivity and dunking it in liquid nitrogen.

To clone Snuppy, the researchers implanted nuclei from his father's ear cells into eggs from female dogs, having removed the eggs» nuclei.

When a sperm cell meets an egg cell (the oocyte), it burrows through the thick outer rind surrounding the egg (the zona pellucida), enters the internal cytoplasm of the egg (the ooplasm), and locomotes its male DNA — half of the typical number of chromosomes — to the female half within about three to four hours.

Yet only a small number of egg cells are produced by the female body, so they are the limiting factor in many aspects of reproductive science.

Keeping egg cells in stasis during childhood is a key part of female fertility.

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.

When this mechanism was abolished in female and male germ cells, precursors of eggs and sperm, it had an impact on the flies» fertility.

Cells destined to become sperm instead developed into eggs when injected into the abdomen (beige oval) of female trout.

A team of scientists has coaxed a rainbow trout cell slated to become sperm to develop into a female egg.

A queen will lay an unfertilized egg in a particular cell only if the cell is big enough to accommodate a male larva, which is bigger than a female one.

Montreal — In humans and other mammals, the female reproductive cells — the eggs or oocytes — need nourishment in order to grow and remain fertile.

In order for all of the clones to have been exact copies of each other, the egg cells would have had to have come from the same female donor.

Meanwhile, the February 2 issue of the New Scientist noted the work being done with stem cells to create «female sperm» and «male eggs.»

gamete: Haploid reproductive cells that combine at fertilization to form the zygote, called sperm (or pollen) in males and eggs in females.

Germ cells develop in the embryo and make up the reproductive system, eventually producing sperm in males and eggs in females.

Germ cell tumors are masses of tissue formed by immature cells that normally would have developed into mature eggs (in a female) or sperm (in a male).

F1 virgin females were collected, transferred to individual cells of plastic 24 - well culture plates (various manufacturers) and given a single fly host to lay eggs.

It is virtually impossible to derive eggs for reproduction from XY (chromosomally male) cells and sperm from XX (chromosomally female) cells.

Scientists are working on a form of IVF where egg cells would be removed from the remaining females, fertilized with semen collected from Sudan and other northern white males, and then inserted into female southern white rhinos who would serve as surrogates.

By contrast, in a female, egg precursor cells divide only 24 times, all but one of these divisions occurring before she is born.

The human sperm cell is haploid, so that its 23 chromosomes can join the 23 chromosomes of the female egg to form a diploid cell.

For you who don't know what is spaying, it is a surgical removal of a female cat's internal reproductive structures and this includes its ovaries or the place where egg cells are produced, Fallopian tubes, uterine horns or the two long tubes where a kitten soon to be develop and grow, and a small part of its uterine body or small parts of uterus which is merged with uterine horns and become one body.

This has actually even been shown to be true of environmental stress on BOTH male and female parents during the creation of the individual sperm and egg cells.

The same is true of the female during her egg cell production; and then again during gestation of her offspring.

Asked where the other dogs that are needed to produce a successful clone came from — dogs in heat from whom egg cells are harvested, and female dogs who serve as surrogates — Russell said ViaGen Pets purchases oocytes from an unnamed provider and that «ViaGen Pets uses a production partner to supply the needed surrogates.»

When a male germ - line chimera is mated to a female germ - line chimera they will have three types of offspring — pure band - tailed pigeons, band - tail - passenger pigeon hybrids, and when an engineered sperm meets an engineered egg cell the result will be a fully formed de-extinct passenger pigeon.