I think "deletion" would be a more appropriate term than "hemizygous".
A deletion occurs when a section of a chromosome has been cut out of the chromosome. Think of a piece of rope. A part of the rope is colored red and the rest is normal tan. Take a knife and cut out some or all of the red part. Then splice the two cut ends of the remaining rope together. The chromosome has no empty part; it has had a piece deleted, making it shorter than the original rope.
Chromosomes that have had a deletion have been found in both fruit flies and mice. Such chromosomes are passed on to following generations just like normal chromosomes. But the action of the deleted gene or genes no longer happens.
The computer I'm on now doesn't have speakers or headphones so I cannot hear the video sound track.I'll get it later, when I get on another computer.
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