The New Encyclopædia BritannicaEncyclopædia Britannica, 1983 - Encyclopedias and dictionaries |
From inside the book
Results 1-3 of 3
Page 254
... spermatozoon cannot occur . In species in which more than one spermatozoon normally enters an egg ( polyspermy ) , only one spermatozoal nucleus ac- tually merges with the egg nucleus . The most important result of fertilization is egg ...
... spermatozoon cannot occur . In species in which more than one spermatozoon normally enters an egg ( polyspermy ) , only one spermatozoal nucleus ac- tually merges with the egg nucleus . The most important result of fertilization is egg ...
Page 255
... spermatozoon ; shading denotes zona reaction . ( D , E ) Completion of meiotic division . ( F ) Pronuclear development . ( G ) Reappearance of chromosome group . ( H ) First cleavage metaphase . Adapted from Biological Review Cambridge ...
... spermatozoon ; shading denotes zona reaction . ( D , E ) Completion of meiotic division . ( F ) Pronuclear development . ( G ) Reappearance of chromosome group . ( H ) First cleavage metaphase . Adapted from Biological Review Cambridge ...
Page 256
... spermatozoon through the zona pellucida appears to be an oblique slit . Association of a mammalian spermatozoon with the egg surface occurs along the lateral surface of the spermato- zoon , rather than at the tip as in other animals ...
... spermatozoon through the zona pellucida appears to be an oblique slit . Association of a mammalian spermatozoon with the egg surface occurs along the lateral surface of the spermato- zoon , rather than at the tip as in other animals ...
Contents
would become the principal reserve asset while gold | 36 |
Excretion the elimination of the waste products of | 50 |
Volumes | 431 |
Copyright | |
2 other sections not shown
Other editions - View all
Common terms and phrases
acid activity amount animals appears become blood body called carried cause cells century changes chemical close common complete consists containing continuous countries depends direction early effect evidence evolution example existence farm federal ferns fibres field Figure fire function gametophyte give groups important increase interest Italy kidney known later leaves less light lines living major marriage material means ment method move movements muscle natural normal obtained occur organs origin percent period person plants position possible present pressure problems produced properties protection reduced remain renal response result retina selection similar social species structure supply surface temperature tend tion types United urine usually various vary