heterosis

views updated May 14 2018

heterosis (hybrid vigour) The increased vigour of growth, survival, and fertility of hybrids, as compared with the two homozygotes. It usually results from crosses between two genetically different, highly inbred lines. It is always associated with increased heterozygosity.

A Dictionary of Zoology MICHAEL ALLABY

heterosis

views updated May 18 2018

heterosis (hybrid vigour) The increased vigour of growth, survival, and fertility of hybrids, as compared with the 2 homozygotes. It usually results from crosses between 2 genetically different, highly inbred lines. It is always associated with increased heterozygosity.

A Dictionary of Plant Sciences MICHAEL ALLABY

heterosis

views updated May 17 2018

heterosis(hybrid vigour) The increased vigour of growth, survival, and fertility of hybrids, as compared with the two homozygotes. It usually results from crosses between two genetically different, highly inbred lines. It is always associated with increased heterozygosis.

A Dictionary of Ecology MICHAEL ALLABY

heterosis

views updated May 21 2018

heterosis (het-er-oh-sis) n. hybrid vigour: the increased sturdiness, resistance to disease, etc., of individuals whose parents are of different races or species.

A Dictionary of Nursing