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Sex Determination — Study Plan

Telangana Open School (TOSS) · Class 12 · Biology

A step-by-step study plan for Sex Determination, Telangana Open School (TOSS) Class 12 Biology: what to learn first, what to practise and when to revise.

40 questions25 flashcards3 formulas & key relations5 concepts

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Study Plan

1
Day 1–2

Learn the Theory

Read the textbook chapter carefully. Note down definitions, formulas and key ideas. Focus on: Types of Chromosomes, Chromosomal Theory of Sex Determination, Types of Sex Determination Mechanisms.

2
Day 3

Practise

Solve the textbook exercises and extra practice questions. There are 40 questions available for this chapter.

3
Day 4

Revise & Test

Revise key points without looking at your notes. Take a practice quiz and mark weak areas for another pass.

4
Day 7

Spaced Revision

Come back to Sex Determination after a week. Use flashcards for quick recall and try past exam questions on this chapter.

What to Focus On

  • Autosomes control somatic traits; sex chromosomes determine sex.
  • Homogametic individuals produce similar gametes (e.g., XX females).
  • Heterogametic individuals produce dissimilar gametes (e.g., XY males).
  • Sex is determined at fertilization by the type of gamete involved.
  • In XX-XO, male gametes are of two types: X and no chromosome.
  • In XX-XY, Y chromosome determines maleness in most cases.
  • Y chromosome in Drosophila is not for sex determination but for male fertility.
  • Sex depends on X/A ratio, not presence of Y.
  • Ratio ≥ 1.0 → Female; ≤ 0.5 → Male; between → Intersex.

Common Mistakes to Avoid

The Y chromosome determines maleness in all organisms.

XX always means female and XY always means male.

The number of sex chromosomes alone determines sex.

Memory Tips

Two types of chromosomes: Autosomes and Allosomes (Sex Chromosomes)

Homogametic = same sex chromosomes (XX), Heterogametic = different (XY or ZW)

XX-XO system: Grasshoppers — males have XO, females XX

XX-XY system: Humans and Drosophila

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Frequently Asked Questions

What are the important topics in Sex Determination for Telangana Open School (TOSS) Class 12 Biology?
Key topics in Sex Determination include Types of Chromosomes, Chromosomal Theory of Sex Determination, Types of Sex Determination Mechanisms, Sex Determination in Drosophila – Genic Balance Theory. Study these first, then practise questions on each for the Telangana Open School (TOSS) Class 12 board exam.
How should I revise Sex Determination for the Telangana Open School (TOSS) Class 12 board exam?
Learn the core ideas first, then work through the 40 practice questions on Sex Determination. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

More resources for Sex Determination

All Telangana Open School (TOSS) Class 12 Biology Study Plan

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