Mendel's Laws and Their Extensions

Name: Mendel's Laws and Their Extensions
Author: StemPy Lab

Two pea plants cross, and the children look like only one of them. Where did the other trait go? You follow Mendel's crosses with one gene and then with two, and you learn to predict the ratios. Then you meet the cases that Mendel did not see: incomplete dominance, codominance, the blood groups, pleiotropy and traits made by many genes. It serves the Indian syllabus (NCERT, NEET) and the matching topic of A-Level, IB and AP.

3 lessons, about 1 h 35 min3 simulations12 problems3 practice questionsPython in every lesson

Created by StemPy Lab

Course outline (3 lessons)

Lesson 1about 30 min
Monohybrid crosses, dominance and segregation
Mendel crossed pea plants and counted every offspring. He found that traits are passed on in units that do not blend. This lesson follows a cross with one gene, from the parents to the F2, and explains dominance, segregation and the test cross.
1 simulation1 practice question1 Python program4 problems1 Python lab
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Lesson 2about 30 min
Dihybrid crosses and independent assortment
Mendel then followed two genes at once. The F2 showed four phenotypes in the ratio 9 : 3 : 3 : 1, because each pair of alleles separates on its own. This lesson builds the dihybrid Punnett square and shows a quick way to find any ratio with the rules of probability.
1 simulation1 practice question1 Python program4 problems
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Lesson 3about 35 min
Beyond simple dominance: multiple alleles, pleiotropy and polygenes
Not every gene follows the simple pattern of a dominant and a recessive allele. A heterozygote can look intermediate, both alleles can show, a gene can have more than two alleles, one gene can affect many traits, and many genes can shape one trait. This lesson meets all five cases.
1 simulation1 practice question2 Python programs4 problems1 Python lab1 question set1 note
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Mendel's Laws and Their Extensions: Practice Paper

19 questions · 15 min

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Mendel's Laws and Their Extensions

Course outline (3 lessons)

Monohybrid crosses, dominance and segregation

Dihybrid crosses and independent assortment

Beyond simple dominance: multiple alleles, pleiotropy and polygenes

Test Your Learning

Your teacher

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