Red hair is recessive trait, non red is dominant character. At which marriages we can expect 100% probability of red-haired children birth? When we can expect 50% and 25 probabilities of red-haired children?

parent one rr parent two rr   100%

parent one Rr parent two rr   50%

parent one Rr parent two Rr    25%

Explanation:

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You can expect 100% red-haired childbirth if a purebred recessive parent and a purebred recessive parent are crossed together. You can expect 50% red-haired childbirth if you cross a purebred recessive parent and a hybrid parent. You can expect 25% red-haired childbirth if a hybrid parent was crossed with a hybrid parent.

primary succession begins with a bare rock and ends with a forest secondary succession begins after a natural disaster where there is a temporary setback after a forest fire or local destruction, but the surrounding area can fill in

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