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NEET UG Genetics and Evolution — practice questions — page 6

Explore 218 free Genetics and Evolution questions in NEET UG Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Genetics and Evolution questions and exercises with answers

Showing questions 151–180 of 218.

If two genes on the same chromosome show a recombination frequency of 1%, they are approximatelyRead the answer and worked solution →In humans, the sex of a child is determined at fertilisation byRead the answer and worked solution →In the human ABO blood group system, a person with blood group AB has the genotype:Read the answer and worked solution →Match each disorder to its chromosomal / genetic cause.Read the answer and worked solution →In Mendel's monohybrid cross of tall × dwarf pea plants, the phenotypic ratio in the F₂ generation wasRead the answer and worked solution →A tall pea plant is crossed with a dwarf plant. Half the offspring are tall and half are dwarf. The genotype of the tall parent must beRead the answer and worked solution →NEET · Biology · Molecular Basis of Inheritance · Histone Octamer — Gap FillRead the answer and worked solution →The Meselson-Stahl experiment proved that DNA replication isRead the answer and worked solution →During transcription, the strand of DNA actually read by RNA polymerase isRead the answer and worked solution →Which eukaryotic RNA polymerase synthesises the mRNA precursor (hnRNA)?Read the answer and worked solution →Which of the following is the universal start codon?Read the answer and worked solution →Approximately how much of the human genome codes for proteins?Read the answer and worked solution →The Central Dogma of molecular biology states that genetic information flows:Read the answer and worked solution →Okazaki fragments are produced during DNA replication on which strand?Read the answer and worked solution →NEET · Bio · Principles of Inheritance · Mendel — TraceRead the answer and worked solution →Translation of mRNA into protein occurs on which cellular structure?Read the answer and worked solution →Introns are best described asRead the answer and worked solution →A nucleosome consists ofRead the answer and worked solution →Naming the processesRead the answer and worked solution →NEET · Biology · Molecular Basis of Inheritance · Operon ComponentRead the answer and worked solution →NEET · Biology · Molecular Basis of Inheritance · Project to YearRead the answer and worked solution →During transcription, the enzyme that synthesises mRNA from DNA is:Read the answer and worked solution →DNA or RNA?Read the answer and worked solution →The central dogma of molecular biology states the flow of information asRead the answer and worked solution →NEET · Bio · Principles of Inheritance · Punnett — Gap FillRead the answer and worked solution →NEET · Bio · Principles of Inheritance · Tap True-Breeding CrossesRead the answer and worked solution →NEET · Bio · Principles of Inheritance · Mendel Concept — MemoryRead the answer and worked solution →NEET · Bio · Principles of Inheritance · Genotype RatioRead the answer and worked solution →NEET · Bio · Principles of Inheritance · Dominant or Recessive — PeaRead the answer and worked solution →NEET · Bio · Principles of Inheritance · Linkage and Crossing OverRead the answer and worked solution →

Worked practice questions

If two genes on the same chromosome show a recombination frequency of 1%, they are approximately

  1. on different chromosomes
  2. completely unlinked
  3. tightly linked, very close together
  4. located on the Y chromosome only
Show answer and solution

Correct answer: C. tightly linked, very close together

Low recombination frequency means crossovers between the two loci are rare — the genes sit close to each other on the chromosome. **Sturtevant's convention:** 1% recombination = 1 map unit (centiMorgan).

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In humans, the sex of a child is determined at fertilisation by

  1. whether the ovum carries X or Y
  2. an autosomal gene on chromosome 7
  3. the mother's age
  4. whether the sperm carries X or Y
Show answer and solution

Correct answer: D. whether the sperm carries X or Y

Females are XX, so every egg carries an X. Males are XY and produce two kinds of sperm — X-bearing and Y-bearing — in roughly equal numbers. The sperm that wins fertilisation decides whether the offspring is XX (girl) or XY (boy).

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In the human ABO blood group system, a person with blood group AB has the genotype:

  1. IA IA only (homozygous)
  2. ii only (homozygous recessive)
  3. IB IB only (homozygous)
  4. IA IB (codominance)
Show answer and solution

Correct answer: D. IA IB (codominance)

**ABO is CODOMINANT:** IA + IB both express in AB phenotype (both A and B antigens on RBCs). IA IA = A; IB IB = B; ii = O; IA IB = AB.

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More Biology topics

Reproduction in Organisms & PlantsBiotechnology and ApplicationsBiodiversity and ConservationThe Living World & Biological ClassificationNeural Control and Chemical CoordinationPrinciples of Inheritance and VariationAnimal KingdomBiology in Human Welfare & Health