If both parents have recessive tongue-rolling genotype (rr), what percentage of offspring can roll their tongue?

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Prepare for the Praxis Elementary Education Exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Ace your test!

Multiple Choice

If both parents have recessive tongue-rolling genotype (rr), what percentage of offspring can roll their tongue?

Explanation:
When a trait is carried by recessive alleles, a child’s genotype comes directly from the alleles the parents can pass. If both parents have the recessive tongue-rolling genotype, they can each only contribute the recessive allele r. Every offspring ends up with genotype rr, which means they won’t express tongue-rolling. So none of the offspring can roll their tongue — 0%.

When a trait is carried by recessive alleles, a child’s genotype comes directly from the alleles the parents can pass. If both parents have the recessive tongue-rolling genotype, they can each only contribute the recessive allele r. Every offspring ends up with genotype rr, which means they won’t express tongue-rolling. So none of the offspring can roll their tongue — 0%.

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