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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
Multiple alleles - ABO blood groups
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The genotypes of a Husband and Wife are $I^AI^B$ and $I^Ai$. Among the blood types of their children, how many different genotypes and phenotypes are possible?
Four genotypes collapse into three phenotypes (A, AB, B).
Husband $I^AI^B$ × Wife $I^Ai$ Offspring: $I^AI^A$, $I^AI^B$, $I^Ai$, $I^Bi$ Number of genotypes = 4 $I^AI^A$ and $I^Ai$ = A; $I^AI^B$ = AB; $I^Bi$ = B Number of phenotypes = 3
Chromosomal disorders
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A disease caused by an autosomal primary non-disjunction is
Trisomy 21 is autosomal; Klinefelter and Turner involve sex chromosomes.
Down's syndrome is caused by non-disjunction of the $21^{st}$ chromosome (an autosome).
Mendel's experiments – seven characters
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Among the following characters, which one was not considered by Mendel in his experiments on pea?
Trichome type was not among Mendel's seven traits.
During his experiments Mendel studied seven characters. The nature of trichomes, i.e. glandular or non-glandular, was not considered by Mendel.
Mendel's experiments – history
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Which one from those given below is the period for Mendel's hybridization experiments?
Mendel worked on peas from 1856 to 1863.
Mendel conducted hybridisation experiments on pea plants for 7 years, between 1856 and 1863, and his data were published in 1865 (according to NCERT).
Mendelian disorders – thalassemia and sickle-cell anaemia
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Thalassemia and sickle cell anemia are caused due to a problem in globin molecule synthesis. Select the correct statement.
Thalassemia = too little globin; sickle cell = faulty globin.
Thalassemia differs from sickle-cell anaemia in that the former is a quantitative problem of synthesising too few globin molecules, while the latter is a qualitative problem of synthesising an incorrectly functioning globin.
That is every question in Principles of Inheritance and Variation for this filter.
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