Question

which is not considered a sex - linked trait?
purple flower color in pea plants
eye color in fruit flies
red - green color blindness in humans
hemophilia in humans

Explanation:

• Purple flower color in pea plants: Pea plants have a diploid number of chromosomes \(2n = 14\). The genes for flower color in pea plants are located on autosomes (non - sex chromosomes). Mendel's experiments with pea plants showed that flower color (e.g., purple vs white) follows autosomal inheritance patterns.
• Eye color in fruit flies: Fruit flies have \(2n=8\) chromosomes, with \(XX\) (female) and \(XY\) (male) sex - determination. The gene for eye color (e.g., red vs white) is located on the \(X\) chromosome, so it is a sex - linked trait.
• Red - green color blindness in humans: Humans have \(2n = 46\) chromosomes (\(XX\) females and \(XY\) males). The gene for red - green color blindness is on the \(X\) chromosome. Males (\(XY\)) are more likely to be affected because they have only one \(X\) chromosome.
• Hemophilia in humans: Similar to red - green color blindness, the gene for hemophilia (a blood - clotting disorder) is on the \(X\) chromosome.

Answer:

purple flower color in pea plants