How is red-green color blindness inherited?

How is red-green color blindness inherited?

• A. Autosomal dominant
• B. X-linked dominant
• C. Autosomal recessive
• D. X-linked recessive

Answer: (D)

Red-green color blindness is primarily inherited in an X-linked recessive pattern. This means that the gene associated with red-green color blindness is located on the X chromosome. Males, who have one X and one Y chromosome, are more likely to express color blindness if they inherit the affected X chromosome since they do not have a second X chromosome that could carry a normal copy of the gene. Females have two X chromosomes, so they would need to inherit two affected X chromosomes to express the trait. If a female has one normal copy of the gene on one X chromosome, she typically will not show symptoms of color blindness, although she may be a carrier and pass on the affected allele to her offspring. Therefore, the condition is more prevalent in males, highlighting the X-linked recessive inheritance pattern. In summary, the correct answer reflects the genetic mechanism by which red-green color blindness is transmitted through generations, emphasizing the role of the X chromosome and the implications for both males and females.

Red-green color blindness is primarily inherited in an X-linked recessive pattern. This means that the gene associated with red-green color blindness is located on the X chromosome. Males, who have one X and one Y chromosome, are more likely to express color blindness if they inherit the affected X chromosome since they do not have a second X chromosome that could carry a normal copy of the gene.

Females have two X chromosomes, so they would need to inherit two affected X chromosomes to express the trait. If a female has one normal copy of the gene on one X chromosome, she typically will not show symptoms of color blindness, although she may be a carrier and pass on the affected allele to her offspring. Therefore, the condition is more prevalent in males, highlighting the X-linked recessive inheritance pattern.

In summary, the correct answer reflects the genetic mechanism by which red-green color blindness is transmitted through generations, emphasizing the role of the X chromosome and the implications for both males and females.