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AP EAMCET Botany Unit 10: Genetics — practice questions — page 2

Explore 47 free Botany Unit 10: Genetics questions in AP EAMCET Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Botany Unit 10: Genetics questions and exercises with answers

Showing questions 31–47 of 47.

Mutant haemoglobin in sickle-cell anaemia polymerises under low oxygen and changes RBC shape fromRead the answer and worked solution →Accumulated phenylalanine becomes which urinary compound?Read the answer and worked solution →Gain or loss of a single chromosome through failed chromatid segregation is calledRead the answer and worked solution →Down's syndrome results from an extra copy of which chromosome?Read the answer and worked solution →An increase in a whole set of chromosomes, often seen in plants, is calledRead the answer and worked solution →How many pairs of autosomes does a normal human cell contain?Read the answer and worked solution →Mendel was the first to apply which approach to biological problems?Read the answer and worked solution →According to the law of segregation, a gamete receives how many alleles of a pair?Read the answer and worked solution →A heterozygous parent produces how many kinds of gametes for that gene?Read the answer and worked solution →In an RrYy plant, what percentage of gametes carry the R allele?Read the answer and worked solution →Mendel could not give what kind of support for his factors, delaying acceptance?Read the answer and worked solution →Which pair of contrasting traits did Mendel study in pea plants?Read the answer and worked solution →Chromosomal aberrations are commonly observed in which kind of cell?Read the answer and worked solution →A true-breeding line is one that shows stable trait inheritance afterRead the answer and worked solution →A heterozygous haemophilia carrier female may transmit the disease to herRead the answer and worked solution →Myotonic dystrophy is given as an example of which inheritance pattern?Read the answer and worked solution →Which feature of skin colour shows it is polygenic?Read the answer and worked solution →

Worked practice questions

Mutant haemoglobin in sickle-cell anaemia polymerises under low oxygen and changes RBC shape from

  1. Biconcave disc to sickle
  2. Sphere to flat disc
  3. Disc to cube shape
  4. Sickle to biconcave disc
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Correct answer: A. Biconcave disc to sickle

Under low oxygen tension the polymerised haemoglobin distorts the biconcave red cell into an elongated sickle.

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Accumulated phenylalanine becomes which urinary compound?

  1. Aminolevulinic acid
  2. Oxaloacetic acid
  3. Phenylpyruvic acid
  4. Homogentisic acid
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Correct answer: C. Phenylpyruvic acid

Excess phenylalanine is converted to phenylpyruvic acid and other derivatives, which harm the brain.

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Gain or loss of a single chromosome through failed chromatid segregation is called

  1. Polyploidy
  2. Translocation
  3. Aneuploidy
  4. Inversion
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Correct answer: C. Aneuploidy

Failure of chromatids to segregate gives aneuploidy, as in Down's and Turner's syndromes.

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