740 



GLOSSARY 



flux the rate of flow or transfer of ions, water, energy, etc., the term being 

 used to denote the quantity that crosses a unit area of a given surface 

 in a unit of time. 



G guanidine. 



gastrula an early stage in embryonic development; it follows the blastula 

 stage. 



Gaussian a type of statistical distribution expressed by a "normal," bell- 

 shaped curve. 



genome the complete complement of genetic material for an organism. 



gibberellic acid an acid, originally extracted from Gibberella, which has 

 morphogenetic efl^ects on plants. 



GTP guanosine triphosphate. 



gynoecium the pistils of a flower. 



HeLa cell a line of cultured cells originally derived from a human cervical 

 carcinoma. 



heterotrophic an organism which is unable to use simple inorganic sub- 

 stances for food. 



heterozygote an individual with different alleles at the same locus on 

 homologous chromosomes. 



hinny a cross between a stallion and a jennet (female jackass). 



histolysis lysis of a tissue. 



HMC hydroxymethylcytosine. 



Holism the doctrine of J. C. Smuts that the properties of the organized 

 whole are more than the summation of its parts. 



homionic refers to clays or exchange materials satmated with only one 

 kind of exchangeable cation. 



homologous similar by virtue of a phylogenetic relationship. 



hyperploid an organism whose chromosome number is greater than a 

 whole number multiple of the haploid number, e.g., 2N + 1 or 2N + 2. 



hypogynous flowers with the sepals, petals, and stamens attached to the 

 receptacle at the base of the ovary. 



hypophysectomy surgical removal of the pituitary gland. 



hysteresis a lagging or retardation of the eftect when the forces or direc- 

 tion of forces acting upon a system are changed. 



lAA indoleacetic acid. 



instar the larval stage of an insect between molts. 



intercalary between primary vascular bundles. 



ion-exchange capacity the capacity (in milliequivalents) of a clay (or 

 root) to bind cations reversibly, due to its possession of negatively 

 charged groups. 



isotropic having the same properties in all directions. 



karyogamy cell conjugation with union of nuclei. 



karyotype the chromosomes of an organism as they appear at metaphase 

 of a somatic division. 



kinase an enzyme transferring a phosphate group from adenosine triphos- 

 phate to an acceptor compound. 



