The recessive nuclear genes (ij) and chloroplast mutator (cm) in maize have been studied as examples of genes whose roles affect the continuity of the plastid and its genetic machinery. The phenotypic expression of cm is ...

To assess the relative importance of regulatory mutations and structural gene mutations in adaptive evolution at the organismal level, two kinds of evidence were considered: 1) Evidence concerning the mechanism by which ...

Three methods have been developed for the transfer of genetic material to wheat chromosomes from alien chromosomes: (i) Use of ionizing radiation to translocate an alien segment. (ii) Induction of homoeologous pairing, ...

Hybrid corn has now replaced open-pollinated varieties almost completely. This change-over has been accompanied by a nearly 3-fold increase in U.S. average yields. The genetic basis for corn breeding rests upon classical ...

Some characteristics of wheat premeiocytes are described as they appear in electron microscopy. These include changes in the endoplasmic reticulum of archesporial cells in premeiotic mitosis (PMM) and some nuclear and ...

Results obtained from aneuploid genetic analyses of isozyme variation in hexaploid wheat have led to the construction of reasonable models for the genetic control and subunit structure of a large number of enzymes. Evidence ...

mutant phenotype causes the plant to fix more nitrogen than the wild type. Such strains might have potential use in agriculture....

SViroids are nucleic acid species of relatively low molecular weight and unique structure that cause several important diseases of cultivated plants. Viroids are the smallest known agents of infectious disease. Unlike viral ...

As causal agents for the separation of the pongid and hominid lines of evolution intelligence, water and the menopause are discussed. The implications of these for the development of human culture and society are investigated.

On the basis of consideration of the patterns of seed differentiation in plants and recent results of developmental genetics in Drosophila, a program is outlined for the production of crops with improved seed characteristics. ...

We review physical studies and electron microscopy of membrane-free folded chromosomes from E. coli [Kavenoff and Bowen, Chromosoma 59, 89 (1977)], and we consider the apparent relation between the organization of the DNA ...

The great majority of animal species exhibit some type of adaptive resemblance. Whether this takes the direction of cryptic resemblance of some type of mimicry is unpredictable. The evidence indicates that all adaptive ...

Alcohol dehydrogenase mutants can be selectively isolated in maize with great efficiency. Structural gene and regulatory mutants have been characterized biochemically, immunologically and genetically. The alcohol dehydrogenase ...