GLOSSARY 



ACCESSORY CHRO'-MO-SOME. An odd chromosome which is found 

 in only half of the spermatozoa of certain animals; see 

 "sex-chromosome." 



A-CHRO'-MA-TIN. The non-staining substance of the nucleus 

 as contrasted with the chromatin. 



A-CHON'-DRO-PLA-SY. A condition in which the long bones 

 cease to grow in length at an early age thus producing a 

 dwarf with large body and head but short limbs. 



ACQUIRED CHARACTER. A character, the differential cause of 

 which is environmental. 



ALTERNATIVE INHERITANCE. Galton's term for a doubtful kind 

 of inheritance in which all characters are derived from one 

 parent. In present use, Mendelian inheritance. 



AM'-NI-ON. One of the embryonic membranes of higher verte- 

 brates. 



AM-PHI-OX'-US. One of the lowest and simplest animals hav- 

 ing a notochord (backbone). 



AN-EN-CEPH'-A-LT. The condition of a brainless monster. 



ANIMAL POLE. That pole of an egg at which the polar bodies 

 are formed. 



AN'-LA-GE. The embryonic basis of any developed part. 



A-OR'-TA. The great artery arising from the heart. 



AR'-CHI-PLASM. The deeply staining plasm surrounding the 

 centrosome. 



AS'-CA-RIS. A genus of round worms which are intestinal 

 parasites. 



AS'-CA-RIS meg-a-lo-ceph'-a-la. A parasite in the intestine of 

 the horse. 



AS-CID'-I-AN. A "sea-squirt"; one of the lowest types having 

 a notochord, or elementary backbone. 

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