Color blindness is a sex-linked recessive trait. Which of the following statements must be true about color blindness?Group of answer choicesIf a mother is color-blind, then all her daughters will be color-blind.A color-blind boy’s father must also be color-blind.Females cannot be color-blind.A color-blind female must have a color-blind father.
Question
Color blindness is a sex-linked recessive trait. Which of the following statements must be true about color blindness?Group of answer choicesIf a mother is color-blind, then all her daughters will be color-blind.A color-blind boy’s father must also be color-blind.Females cannot be color-blind.A color-blind female must have a color-blind father.
Solution
The statement that must be true about color blindness is: "A color-blind female must have a color-blind father."
Here's why:
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"If a mother is color-blind, then all her daughters will be color-blind." This statement is not necessarily true. A color-blind mother will pass on the color-blind gene to her daughters, but whether the daughters are color-blind or not also depends on the gene they receive from their father. If the father has normal vision, the daughters will be carriers of the color-blind gene but will not be color-blind themselves.
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"A color-blind boy’s father must also be color-blind." This statement is not true. Color blindness is a sex-linked trait, which means it is carried on the X chromosome. Males have one X chromosome (from their mother) and one Y chromosome (from their father). A color-blind boy would have received the color-blind gene from his mother, not his father.
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"Females cannot be color-blind." This statement is not true. Females can be color-blind, although it is less common than in males. A female would be color-blind if she received the color-blind gene from both her mother and her father.
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"A color-blind female must have a color-blind father." This statement is true. Since color blindness is a sex-linked trait, a color-blind female must have received the color-blind gene from both her mother and her father. Since males have only one X chromosome, a father who carries the color-blind gene is color-blind himself. Therefore, a color-blind female must have a color-blind father.
Similar Questions
Color blindness is an X-linked recessive trait. A male that is not color-blind is crossed with a female that is a carrier for color blindness. If they have a girl, what is the probability she will be color-blind?Group of answer choices75%25%0%100%50%
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Red-green color blindness is much more common in males because Blank______.Multiple choice question.females have more cone cells than males dothe disease is triggered by testosteroneestrogen has a protective effect on visionthe abnormal gene is on the X chromosome
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