Sometimes it’s easy to tell if something is living or not. A teddy bear might look like a bear, but it cannot do any of the seven things it needs to be able to do to count as being alive.

The biological research of UC Santa Cruz's Needhi Bhalla to determine the molecular motions at the heart of heredity has yielded a new discovery: The proper transfer of genetic materials depends on ...

A centriole is a cylindrical structure within the cell that plays a part in cell reproduction. The activities within this cell are the same as in the mitosis-dividing cell. NOTE: Blue indicates ...

In most multicellular organisms, meiosis is restricted to germ cells that are set aside in early development. The germ cells reside in specialized environments provided by the gonads, or sex organs.

During meiosis, the cells needed for sexual reproduction divide to produce new cells called gametes. Gametes contain half as many chromosomes as the other cells in the organism, and each gamete is ...

The fluids provide the sperm cells with nutrients ... A penis goes into the vagina during sexual reproduction. This is also where menstrual blood leaves the body and where a baby exits during ...

A new study reveal for the first time that the guinea pig pre-implantation embryo is very similar to the human embryo, spurring a better understanding of infertility and early human development.

Progesterone stimulates histone citrullination to increase IGFBP1 expression in uterine cells. Reproduction. 2021 Jul 8;162(2):117-127. doi: 10.1530/REP-21-0132. PMID: 34034233; PMCID: PMC8284904.

Take the evolution of sex, for instance. To make the move from asexual to sexual reproduction, nature took a system by which parent cells reproduced simply by dividing (asexual reproduction ...