Science Class 10
Heredity
Predict a pea cross's offspring ratio using dominant and recessive genes.
10 lessons · ~78 min total
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Lessons in this topic
- 0 Start here A roadmap of genes in pairs. One copy comes from each parent. Pea crosses show the counting rule. · 5 min You are here
- 1 Resemble both, match neither Each parent gives one copy of every gene. So a child can match neither parent. · 9 min
- 2 The man who counted Mendel used true lines, crossed them by hand, and counted every offspring. · 8 min
- 3 The hidden one comes back A dominant copy shows itself. A recessive copy hides, then returns in the second generation. · 9 min
- 4 The count is the argument Two Tt plants give four equally likely pairs. Three pairs make tall plants and one makes a short plant. Big counts settle near that. · 9 min
- 5 Two traits at once Two gene pairs pass on separately. Sixteen boxes give about nine, three, three, one. · 9 min
- 6 Which contribution decides A mother's egg always carries X. A father's sperm carries X or Y. So the father's cell decides a child's sex. · 8 min
- 7 The laws in plain words Dominance, segregation and independent assortment are three short rules. They predict a cross. · 8 min
- 8 The big picture Genes come in pairs, separate fairly, and sort independently. · 5 min
- 9 Track quiz The rules first, then one short question on each. · 8 min
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