striking utilization of this fact has come in corn breeding, where the hybrid is often able to fix food materials in excess of 2 or 3 times that of the inbred parents. But the observation is not limited in any way to corn. It is true in most instances for small grains, vegetables, fruits, flowers, economic animals, domestic birds and man.Universal as this phenomenon is, exceptions do occur.These exceptions are as interesting as the occurrences, for they serve to demonstrate that there is much behind hybridity we do not understand.The purpose of this series of papers is to study the mechanisms which lead to this striking capacity of race crosses to metabolize. Drosophila melanogaster egg production was chosen for study.The work was begun in the early part of 1937 when an analysis of heterotic effects as related to cytoplasm and chromosomes was approached through the -use of inversion test stocks for the formation of homozygous races.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.