Biology Forum › Genetics › A question
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- March 13, 2012 at 5:33 pm #16218
bertstareParticipantA white woman marries a black man.They have four children-2 sons and 2 daughters.What proportion of these children is likely to be black.
1-25%
2-50%
3-100%
4-noneAnswer in the science General Knowledge book is 4.I want the explanation for this.
- March 14, 2012 at 10:06 am #110145JackBeanParticipant
what is 4.1? None and 25%?
To my knowledge the skin color is not sex determined, thus, if we assume they parents are not mixed already, we should expect 50% (although it will be rather that all four children will be slightly black)
- March 14, 2012 at 4:22 pm #110149javedshaikmParticipant
As per my knowledge – let us assume
1) white woman(WWbb – gamete ) marries Black man (BBww – gamete)
then first generation would be(in normal case) –White Daughter (WWBw) + White son (WwBw)
or
White Daughter (WWBw) + black son (BwBw)
So the percentage would be 25%
- March 14, 2012 at 7:26 pm #110157canalonParticipant
Do you really think that skin color in human is a single trait that is present or absent? If so I suggest that you get out of your home and walk on the streets for a few minutes…
- March 14, 2012 at 10:38 pm #110159wbla3335Participant
The question makes the assumption that the woman and the man are purebreds (hard to find these days). Any offspring between the two cannot therefore be purebred white or black (answer 4). As canalon implies, people aren’t peas.
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