In a monohybrid cross Aa x Aa, what is the probability that offspring show the recessive phenotype?

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $24.99Unlock all

Study for the IAC White Set Science Bee Test. Enhance your knowledge with quizzes and detailed explanations. Prepare effectively and excel on your test!

Multiple Choice

In a monohybrid cross Aa x Aa, what is the probability that offspring show the recessive phenotype?

Explanation:
In a monohybrid Aa x Aa cross, the key idea is that a recessive phenotype appears only when the organism has two recessive alleles, one from each parent. Each parent can pass either A or a with equal chance. So the possible offspring genotypes are AA, Aa, aA, and aa, all equally likely. Only the two-recessive aa combination shows the recessive trait, which is 1 out of these 4 possibilities. That equals 25%. The dominant trait shows up in the other three combinations (AA and Aa or aA each have at least one A). So the probability of recessive phenotype is 25%.

In a monohybrid Aa x Aa cross, the key idea is that a recessive phenotype appears only when the organism has two recessive alleles, one from each parent. Each parent can pass either A or a with equal chance. So the possible offspring genotypes are AA, Aa, aA, and aa, all equally likely. Only the two-recessive aa combination shows the recessive trait, which is 1 out of these 4 possibilities. That equals 25%. The dominant trait shows up in the other three combinations (AA and Aa or aA each have at least one A).

So the probability of recessive phenotype is 25%.

More Multiple Choice Questions
Subscribe

Get the latest from Passetra

You can unsubscribe at any time. Read our privacy policy