A father has a dominant gene for brown eyes and a recessive gene for blue eyes. A mother has two recessive genes for blue eyes. Both parents can speak Japanese. The parents have a daughter with brown eyes who can also speak Japanese. Which of the following statements explains their daughter's traits?
A.
The daughter inherited a dominant brown-eye gene from her father and the ability to speak Japanese from her mother.
B.
The daughter inherited a dominant brown-eye gene from her father but acquired the ability to speak Japanese.
C.
The daughter inherited a recessive blue-eye gene from her father but acquired the ability to speak Japanese.
D.
The child inherited a recessive blue-eye gene from her father and the ability to speak Japanese from her mother.
A. The daughter inherited a dominant brown-eye gene from her father and the ability to speak Japanese from her mother.
The correct answer is:
A. The daughter inherited a dominant brown-eye gene from her father and the ability to speak Japanese from her mother.
In order to understand which statement explains the daughter's traits, let's break down the genetic and linguistic information provided.
The father has a dominant gene for brown eyes and a recessive gene for blue eyes. This means that his genotype is Bb, where B represents the dominant brown-eye gene and b represents the recessive blue-eye gene.
The mother has two recessive genes for blue eyes, indicating that her genotype is bb.
The daughter has brown eyes, implying that she received a dominant brown-eye gene from either her father (B) or her mother (b).
In terms of language ability, both parents can speak Japanese. This suggests that the daughter has the potential to inherit the ability to speak Japanese from either parent.
Now, let's evaluate the statements:
A. The statement suggests that the daughter inherited a dominant brown-eye gene from her father and the ability to speak Japanese from her mother. Based on the given information, this statement is plausible, as the father has the dominant brown-eye gene and the mother can speak Japanese.
B. This statement implies that the daughter acquired the ability to speak Japanese, which contradicts the fact that both parents already speak Japanese. Therefore, this statement is not consistent with the information provided.
C. The statement suggests that the daughter inherited a recessive blue-eye gene from her father but acquired the ability to speak Japanese. However, this contradicts the information given, as the father has a dominant brown-eye gene and not a recessive blue-eye gene.
D. The statement proposes that the child inherited a recessive blue-eye gene from her father and the ability to speak Japanese from her mother. However, based on the information given, we know that the father has a dominant brown-eye gene, not a recessive blue-eye gene.
By analyzing the options, we can conclude that option A is the most accurate statement. The daughter inherited a dominant brown-eye gene from her father and the ability to speak Japanese from her mother.