in Heredity and Variation by

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Example 1

Seen in Snapdragon (Antirrhinum majus) and Mirabilis jalapa (four o’clock plant)

A cross between Red flowered varieties (RR) and White flowered varieties (rr) produces a progeny of all pink flowered varieties (Rr) in the F1 generation.

[ Reference: http://iws.collin.edu/biopage/faculty/mcculloch/1406/notes/genetics/incomdom2.htm]

Example 2

Andalusian fowl

A cross between pure forms Black (BB) and White (bb) produces blue coloured individuals (Bb) in the F1 generation.

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