Punnett Square: Homozygous × Heterozygous — NEET Biology
📚 Practice Concept📖 NCERT Source
Using a Punnett Square, workout the distribution of phenotypic features in the first filial generation after a cross between a homozygous female and a heterozygous male for a single locus.
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QuestionPractice Question
In a cross between a male and female, both heterozygous for the sickle cell anaemia gene, what percentage of the progeny will be diseased? (NEET 2021)
📖 Solution & NCERT Explanation
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Correct answer: C — 25%
Parents: HbA HbS × HbA HbS Punnett square: HbA HbA → Normal HbA HbS → Carrier HbS HbS → Sickle cell disease Genotypic ratio: 1 (Normal) : 2 (Carrier) : 1 (Diseased) So, 1 out of 4 (25%) progeny will be diseased (HbS HbS).
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What does NCERT say about Using Punnett Square workout?
Using a Punnett Square, workout the distribution of phenotypic features in the first filial generation after a cross between a homozygous female and a heterozygous male for a single locus.
Has this concept appeared in NEET?
Practice this NCERT concept with questions on MedicNEET.
Which chapter is this from?
Principles of Inheritance and Variation, Class 12 NCERT Biology.
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