Yes, alleles is a Scrabble word!

...and is worth 7 points in Scrabble, and 10 points in Words with Friends

alleles

Noun

1. (genetics) either of a pair (or series) of alternative forms of a gene that can occupy the same locus on a particular chromosome and that control the same character

What Scrabble words can I make with the letters in alleles?

6 Letter Words

allees
allele

5 Letter Words

allee
easel
lalls
lease
selle

4 Letter Words

alee
ales
alls
ease
eels
ells
else
lall
lase
leal
leas
lees
sale
sall
seal
seel
sell

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Words that can be created with an extra letter added to alleles: