Chromosomes, Linkage and Sex

Name: Chromosomes, Linkage and Sex
Author: StemPy Lab

Mendel never saw a chromosome. Later workers found that genes sit on chromosomes, and that explains both his laws and the places where they fail. You see how linked genes travel together, how crossing over breaks the link, and how a map is made from the counts. Then you follow the ways in which sex is decided, and the traits tied to the X chromosome, such as haemophilia and colour blindness. It serves the Indian syllabus (NCERT, NEET) and the matching topic of A-Level, IB and AP.

3 lessons, about 1 h 30 min3 simulations12 problems3 practice questionsPython in every lesson

Created by StemPy Lab

Course outline (3 lessons)

Lesson 1about 30 min
The chromosomal theory, linkage and recombination
Mendel never saw a chromosome, yet his factors travel on chromosomes. This lesson shows why the chromosomes behave like Mendel's factors, what linkage is, how crossing over breaks it, and how the counts of recombinant offspring make a map of the genes.
1 simulation1 practice question1 Python program4 problems1 Python lab
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Lesson 2about 30 min
Sex determination
Sex is decided in different ways in different animals. This lesson covers the four systems that an exam asks about: XX and XY in humans and the fruit fly, XX and XO in some insects, ZZ and ZW in birds, and the haplo-diploid honey bee. You find which parent decides the sex and why the ratio is near 1 : 1.
1 simulation1 practice question1 Python program4 problems
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Lesson 3about 30 min
Sex-linked inheritance and pedigrees
Some genes sit on the X chromosome, and a son has only one X. This lesson explains why haemophilia and colour blindness are more common in men, works out the crosses with exact fractions, and shows how to read a pedigree.
1 simulation1 practice question1 Python program4 problems1 Python lab1 question set1 note
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← Principles of Inheritance and Variation

← Mendel's Laws and Their Extensions Mutations and Genetic Disorders →

More onHeredity and Evolution › Principles of Inheritance and Variation

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Chromosomes, Linkage and Sex

Course outline (3 lessons)

The chromosomal theory, linkage and recombination

Sex determination

Sex-linked inheritance and pedigrees

Test Your Learning

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