If a trait in humans is controlled by a single gene and is dominantly inherited, but...
If a trait in humans is controlled by a single gene and is dominantly inherited, but only 50% of people who are heterozygous actually show the condition, whichof these is the best description of this phenomenon?
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Incomplete penetrance |
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Epistasis |
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Codominance |
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Sex-linked gene |
Homework Answers
The answer is Sex-linked gene , It is a gene located in the Sex-chromosome. In humans the sex chromosomes are namely X chromosome and Y chromosome.
Females have a pair of X chromosomes, But Males have a Y chromosome instead of the other X chromosome in females.
That is ,
Females - XX ( Homozygous )
Males - XY ( Heterozygous )
A sex linked gene may occur in either one of these sex chromosomes.
If the sex linked gene is situated in Y chromosome, the heterozygous males only will dominate that , other than females.
We can't predetermine the sex of a baby , the chance to get a baby male or baby female is 50:50. Like that if the sex linked gene is dominately inherited which in present on Y chromosome , that will dominately inherited only in heterozygous (XY) peoples, that is males ( 50% ).
So the phenomenon is Sex linked gene.
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