Sentences with phrase «genes controlling sperm»

Newly selected mutations in genes controlling sperm production show up in every ethnic group he and his team have studied; those genes may affect characteristics including abundance, motility, and viability.

Not exact matches

We've been hearing about better male birth control for years now, but in recent weeks two new promising options have come to light: RISUG (reversible inhibition of sperm under guidance), being developed by an Indian scientist, Sujoy Guh, and the discovery of a gene, Katnal1, critical for sperm production; if scientists can tweak the gene with a pill, sperm production will be stalled.

The genes that control the sperm - making machinery are all packed into a single chromosome — the Y chromosome, the one that confers maleness.

In his paper, Mr Gellatly demonstrates that it is likely men carry two different types of allele, which results in three possible combinations in a gene that controls the ratio of X and Y sperm;

The Newcastle University study suggests that an as - yet undiscovered gene controls whether a man's sperm contains more X or more Y chromosomes, which affects the sex of his children.

Genes there appear to control both body size and sperm production, and because these genes are not active in females, they can evolve independently of their effect on female survGenes there appear to control both body size and sperm production, and because these genes are not active in females, they can evolve independently of their effect on female survgenes are not active in females, they can evolve independently of their effect on female survival.