Eye Colour Inheritance in Drosophila | Sex-linked Inheritance Morgan Experiment | NEET| Neela Bakore

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Morgan’s Drosophila experiment — criss-cross (sex-linked) inheritance revealed!

📌 Topics Covered:
• White eye — X-linked recessive trait
• Cross 1: Red-eyed ♀ × white-eyed ♂ → F1 and F2
• Reciprocal cross → criss-cross inheritance pattern
• Why sex-linked traits show different ratios in males and females
• NEET MCQ strategies
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Transcript with Timestamp
0:00 Introduction — Eye colour in Drosophila, Morgan’s experiment
0:35 Drosophila melanogaster — 4 pairs of chromosomes, 2-week life cycle
1:06 Scientist: Morgan. Normal eye = red. Mutant = white eye (1 male found)
4:19 White eye gene on X chromosome: W=red (dominant), w=white (recessive)
8:01 Cross: white-eyed male (XʷY) × red-eyed female (XᵂXᵂ pure)
10:13 F1: females XᵂXʷ (red), males XᵂY (red) — all red
11:49 Law of dominance confirmed in F1
12:05 White gene goes from parent male to F1 daughters
12:05 F2: red female (XᵂXʷ) × red male (XᵂY)
13:21 F2 results: XᵂXᵂ, XᵂXʷ (both red female), XᵂY (red male), XʷY (white male)
15:07 CRISS-CROSS INHERITANCE: male → F1 female → F2 male
16:30 Two types: Dihybrid type (parent male → F1 female → F2 male) and Diandric type
(parent female → F1 male → F2 female)
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