Given equal probabilities of the birth of an xy offspring or an xx offspring, what is the probability that a group of four siblings includes all xy offspring? all xx offspring? all xy offspring or all xx offspring?.

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20-01-2022
Biology

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Given equal probabilities of the birth of an xy offspring or an xx offspring, what is the probability that a group of four siblings includes all xy offspring? all xx offspring? all xy offspring or all xx offspring?.

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luisvaschetto luisvaschetto · Answer 1 · 2022-01-28T10:50:14+01:00

The probability that a group of four siblings includes all XY is 1/16 (6.5%), while the probability all XX offspring is 1/16 (6.5%). It is a simple genetic probability calculation.

Genetic probabilities and chromosomes

Females inherit two chromosomes X, whereas males inherit one chromosome X and one chromosome Y.

The probabilities of inherent two chromosomes X (females) are 1/2 (50%), while the probabilities of inherent one chromosome X and one chromosome Y (males) are also 1/2.

In consequence, the probability that a group of four siblings includes all XY is 1/16 (because it is equal to 1/2 x 1/2 x 1/2 x 1/2 = 1/16), the same for the probability all XX offspring (1/16).

Learn more about genetic probabilities here:

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