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Biology
Principles of Inheritance and Variation
198 questions from 38 papers, each with its answer.
- 198 questions
- 38 papers
- 5.62% of Biology
Chromosomal disorders
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An abnormal human baby with 'XXX' sex chromosomes was born due toAn abnormal ovum carrying an extra X chromosome (22 + XX), fertilised by a normal X-bearing sperm, gives a 44 + XXX baby.
So the cause is formation of abnormal ova in the mother.
Multiple alleles and codominance
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A man with blood group 'A' marries a woman with blood group 'B'. What are all the possible blood groups of their offspring?
If the parents are heterozygous: man $I^Ai$, woman $I^Bi$.
Gametes: $I^A$, $i$ and $I^B$, $i$.
Offspring: $I^AI^B$ (AB), $I^Ai$ (A), $I^Bi$ (B), $ii$ (O).
So all four blood groups A, B, AB and O are possible.
That is every question in Principles of Inheritance and Variation for this filter.
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