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Sex Determination

Telangana Open School (TOSS) · Class 12 · Biology

Step-by-step guide to study Sex Determination in Telangana Open School (TOSS) Class 12 Biology. Topics to cover, practice strategy, and time allocation.

40 questions25 flashcards5 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 concepts.

2
Day 3

Practice Problems

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

3
Day 4

Revise & Test

Revise key formulas and concepts without looking at notes. Take a practice quiz to test your understanding. Mark weak areas for re-revision.

4
Day 7

Spaced Revision

Revisit Sex Determination after a week. Use flashcards for quick recall. Solve previous year questions from 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?
Sex Determination covers several key topics that are frequently asked in Telangana Open School (TOSS) Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Sex Determination — Telangana Open School (TOSS) Class 12 Biology?
Understand the core concepts first, then work through the 40 practice questions available for this chapter. Revise formulas and 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.

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