Answer:
They both have curved thumbs,likes hot sauce, they both listen to music, they both have nails and hair and they both live in the same house
Explanation:
The gene that Syd and Alex have in common is of hair, nails, curved thumbs, liking for hot sauce and music.
Hence, the genes that Syd and Alex have in common whether they are siblings or not are genes for hair, nails, curved thumbs, liking for hot sauce and music.
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