World 1 · Mendel Basics · 6 minHomozygous crosses
True-breeding lines
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A true-breeding (homozygous) line always passes the same allele. CC × CC gives only CC; cc × cc gives only cc.
Cross two different homozygotes — CC × cc — and every offspring is Cc: the uniform F₁ generation.
Check yourself
Crossing a true-breeding cobalt (CC) with a cream (cc), the F₁ offspring are:
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