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

Long DNA molecules called chromosomes contain all or a portion of an organism's genetic code. Males receive one X and one Y chromosome from each parent, whereas females receive two X chromosomes from each parent.

For females, the likelihood or probability of inheriting two X chromosomes is 1/2 (50%) while for men, the probaility of receiving one X chromosome and one Y chromosome is similarly 1/2.

Therefore, the probability that all XY siblings are present in a group of 4 siblings is:

[tex]1/2 * 1/2 * 1/2 * 1/2 = 1/16[/tex]

Also the probability that a family of four siblings or offspring includes all XX is

[tex]1/2 * 1/2 * 1/2 * 1/2 = 1/16[/tex]

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shomerajeshwari90 shomerajeshwari90 · Answer 2 · 2022-10-27T08:45:15+02:00

The probability of all XY in a group of four siblings is 1/16 (6.5%), and also the probability of all XX offspring is 1/16 (6.5%).

For females, the likelihood or probability of inheriting two X chromosomes is 1/2 (50%) while for men, the probability of receiving one X chromosome and one Y chromosome is similarly 1/2.

Therefore, the probability that all XY siblings are present in a group of 4 siblings is:

1/2*1/2*1/2*1/2=1/16

Also the probability that a family of four siblings or offspring includes all XX is

1/2*1/2*1/2*1/2=1/16

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