Question

Which of the following phenotypes shows up more often in human males than in human females?...

Which of the following phenotypes shows up more often in human males than in human females?

1. Colorblindness

2. Huntington's Disease

3. Sickle Cell Anemia

4. Type B blood
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Answer #1

Answer : 1 ; Colorblindness.

Explanation : It is more found in human males. Colorblindness is a one type of X-linked inheritance. In that case the gene responsible for colorblindness are located on the X chromosome, males have only one X chromosome whereas females have two X chromosomes. As males have only one X chromosome so if it defective then it enough close to cause colorblindness in males but in females have two X chromosomes, so in that case it requires two defective X chromosome to cause colorblindness. This type of inheritance pattern is called X-linked inheritance and it primarily affects males.

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