GLOSSARY 743 



T-phages Tl, T2, T3, T4, T5, T6, T7. 



transduction the transfer of genetic material from one cell to another when 

 mediated by a bacteriophage. 



trophoblast the enveloping layer of cells of the early embryo which will 

 attach the ovum to the uterine wall and supply nutrition to the embryo. 



tropophytia a class of ecosystem having environmental controls well bal- 

 anced in effectiveness but alternating in time. 



/x micron ( 10"'' meter). 



;uc microcurie. 



UDPG uridinediphosphoglucose. 



fjceq. micro equivalent. 



/^mole micromole. 



versene ethylenediaminetetraacetic acid. 



wether a ram castrated prepubertally. 



xerophytia a class of ecosystem predominantly controlled by scarcity of 

 water. 



zygomorphic irregularly shaped flowers with bilateral symmetry. 



zygote the cell resulting from the union of the male and female gametes. 



