Class 12 Biology: Principles of Inheritance and Variation
This worksheet tests your understanding of fundamental concepts in inheritance and variation, including Mendelian genetics, incomplete dominance, codominance, and genetic disorders.
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Track practice: print a star chart
- Q1.Which of the following is an example of incomplete dominance?
- A.ABO blood groups in humans
- B.Flower color in Mirabilis jalapa (4 o'clock plant)
- C.Coat color in cattle (Roan)
- D.Sickle cell anaemia
- Q2.If a dihybrid cross is performed between two heterozygous individuals (AaBb x AaBb), what will be the phenotypic ratio in the F2 generation?
- A.3:1
- B.9:3:3:1
- C.1:2:1
- D.1:1
- Q3.The phenotypic expression of all the genes present in an individual is called its ____.
- Q4.Turner’s syndrome is caused by the loss of a ____ chromosome.
- A.single autosome
- B.single X
- C.single Y
- D.pair of autosomes
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What's inside this workbook
This Class 12 Biology Practice contains 10 questions across 2 printable pages and includes a full answer key at medium difficulty. Aligned to the CBSE and NCERT syllabus.
How this worksheet helps your child
- Builds confidence in core Biology concepts taught in Class 12 through repeated, varied practice.
- Aligned to CBSE and NCERT — questions mirror the pattern children see in school tests and unit assessments.
- Comes with an answer key so parents and students can self-check in minutes, without needing a teacher.
- Pitched at medium level — use it for daily homework, weekend revision or quick exam warm-ups.
Topics covered
How to use this worksheet at home
Open the print view and use your browser's Print dialog to print on regular A4 paper or save as a PDF. Hand the printed sheet to your child (Class 12) and set a relaxed time limit — 15 to 25 minutes works for most Biology worksheets. When they're done, open the "With answer key" view and let them self-mark question by question. Re-print as many times as you need; the file never expires and there's no download limit.
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- Is it aligned to the CBSE / NCERT syllabus?
- Yes. All Class 12 worksheets are built around the CBSE and NCERT pattern so they map cleanly to what your child is studying in school.
- Can I print this worksheet at home?
- Yes. Click "Open print view" and use your browser's Print dialog to print on standard A4 paper, or save it as a PDF for later. The layout is designed to fit cleanly without scaling.
- Does it include an answer key?
- Yes — click "With answer key" to print a version with answers included, so parents and students can self-mark in minutes.
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