Suppose "A" Is a Dominant Gene for the Ability to Curl

question 22

Multiple Choice

Suppose "A" is a dominant gene for the ability to curl the tongue lengthwise, and "a" is a recessive gene for inability to do so. Which of the following couples can be certain that all their children will be able to curl their tongue lengthwise?

• A) father aa, mother AA
• B) father Aa, mother Aa
• C) father aa, mother aa
• D) father Aa, mother aa

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