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Chapter Summary

Sex Determination

Telangana Open School (TOSS) · Class 12 · Biology

Summary of Sex Determination for Telangana Open School (TOSS) Class 12 Biology. Key concepts, important points, and chapter overview.

40 questions25 flashcards5 concepts

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Overview

Sex determination is the biological process that decides whether an individual will develop as male or female. This process is primarily governed by specific chromosomes known as sex chromosomes or allosomes. In most organisms, sex is determined at the moment of fertilization based on the combinatio

Key Concepts

Autosomes are chromosomes that carry genes

Autosomes are chromosomes that carry genes for general body traits and are present in pairs in both males and females. Allosomes, or sex chromosomes,

Sex is determined by the type

Sex is determined by the type of sex chromosomes present. Systems include XX-XO, XX-XY, ZW-ZZ, and ZO-ZZ, depending on the species. In XX-XY system, m

Proposed by Calvin Bridges

Proposed by Calvin Bridges, this theory states that sex in Drosophila is determined by the ratio of X chromosomes to sets of autosomes (X/A). A ratio

In honeybees

In honeybees, females (queens and workers) develop from fertilized eggs and are diploid (2n), while males (drones) develop from unfertilized eggs and

While chromosomes determine sex

While chromosomes determine sex, hormones control the development of secondary sexual characteristics. In some cases like fowls and cattle, hormonal i

Learning Objectives

  • Understand the role of chromosomes in sex determination
  • Differentiate between autosomes and allosomes
  • Explain various chromosomal systems of sex determination
  • Describe the genic balance theory in Drosophila
  • Understand haplodiploidy in honeybees

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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