Performance Task: Search the internet for other examples of sex-linked, sex-limited, and sex-influenced traits in humans. You should include only one (1) trait for each type. From the information that you will gather, make a leaflet/pamphlet that discusses the traits, how they affect the individual, or other information about the traits. This leaflet/pamphlet will serve as an information dissemination material. It can be useful to give awareness to your classmates and friends regarding the occurrence of these traits.
• Be guided by the following criteria:
- Presentation – 10
- Creativity – 10
- Neatness – 5
- Punctuality – 5
- TOTAL – 30 Points
• Be guided by the following criteria:
- Presentation – 10
- Creativity – 10
- Neatness – 5
- Punctuality – 5
- TOTAL – 30 Points
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Answer:
Sex-Limited, Linked, and Influenced Traits
Some traits are carried on the sex chromosomes, X and Y. Most traits carried are present on only the X-chromosome. The Y-chromosome is smaller, and so, very few genes are located on this chromosome.
Sex traits can be categorized into three types of inheritance: sex-limited, sex-linked, and sex-influenced. Sex-limited traits are traits that are visible only within one sex. For instance, barred coloring in chickens normally is visible only in the roosters.
Sex-linked traits would be considered traits like sickle cell anemia and color blindness. They are said to be linked because more males (XY) develop these triats than females (XX). This is because the females have a second X gene to counteract the recessive trait. Thus, the trait is more likely to be visible in the male.
Sex-influenced traits are autosomal traits that are influenced by sex. If a male has one recessive allele, he will show that trait, but it will take two recessive for the female to show that same trait. One such gene is baldness.
A lot of sex-limtied traits can determine parental carriers by using a pedigree. The colored blocks indicate a recessive trait phenotype, and from there, carriers can be traced back. This is an effective method when determining the probability of an offspring receiving that trait.
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Search in Internet
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