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ZOOLOGY: T. H. MORGAN 
Grou p I 
Group II 
Group III 
Group IV 
Abnormal 
Antlered 
Band 
Bent 
Bar 
Apterous 
Beaded 
Eyeless 
Bifid 
Arc 
Cream III 
Bow 
Balloon 
Deformed 
Cherry 
Black 
Dwarf 
Chrome 
Blistered 
Ebony 
Cleft 
Comma 
Giant 
Club 
Confluent 
Kidney 
Depressed 
Cream II 
Low crossing over 
Dotted 
Curved 
Maroon 
Eosin 
Dachs 
Peach 
Facet 
Extra vein. 
Pink 
Forked 
Fringed 
Rough 
Furrowed 
Jaunty 
Safranin 
Fused 
Limited 
Sepia 
Green 
Little crossover 
Sooty 
Jaunty 
Morula 
Spineless 
Lemon 
Olive 
Spread 
Lethal's, 13 
Plexus 
Trident 
Miniature 
Purple 
Truncate intensifier 
Notch 
Speck 
Whitehead 
Reduplicated 
Strap 
White ocelli 
Ruby 
Streak 
Rudimentary 
Trefoil 
Sable 
Truncate 
Shifted 
Vestigia] 
Short 
Skee 
Spoon 
Spot 
Tan 
Truncate intensifier 
Vermilion 
White 
Yellow 
A group consists of those characters that are inherited together, or 
rather tend to be inherited together. The chromosome groups of the 
male and of the female of Drosophila ampelophila are shown in figure 4. 
There is a pair of sex chromosomes, two pairs of large chromosomes, 
and a very small pair — four pairs in all. The coincidence between the 
number of hereditary groups and of the chromosomes is sufficiently evi- 
dent to render comment unnecessary. 
Crossing over. I have said that the characters that belong to the first 
group tend to be inherited together. Thus, if a fly with white eyes 
and yellow wings be crossed to the wild type, having red eyes and gray 
wings, the second generation of flies will be white yellow and gray red 
gray, except that once in a hundred times a fly will be found that is white 
