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AP EAMCET Botany Unit 10: Genetics — practice questions

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 1–30 of 47.

The law of dominance explains which F2 proportion in a monohybrid cross?Read the answer and worked solution →In snapdragon, the F2 phenotype ratio from selfed pink F1 plants isRead the answer and worked solution →Why does the heterozygous snapdragon Rr flower look pink rather than red?Read the answer and worked solution →How many alleles of the I gene control human ABO blood groups?Read the answer and worked solution →How many different ABO genotypes are possible from the three I gene alleles?Read the answer and worked solution →A person with genotype IAIB has red cells showing both A and B sugars. This is due toRead the answer and worked solution →The RrYy plant produces gametes of how many genotypes, each at 25 per cent?Read the answer and worked solution →In what year did Mendel publish his work on inheritance of characters?Read the answer and worked solution →Who independently rediscovered Mendel's work in 1900?Read the answer and worked solution →Which Drosophila gene pair had only 1.3 per cent recombination?Read the answer and worked solution →Which Drosophila gene pair recombined at 37.2 per cent?Read the answer and worked solution →What did Sturtevant use to map genes on a chromosome?Read the answer and worked solution →A single gene that produces multiple phenotypic effects is calledRead the answer and worked solution →Phenylketonuria arises from a mutation in the gene for which enzyme?Read the answer and worked solution →What name did Henking give to the nuclear structure seen in only half the sperm of some insects?Read the answer and worked solution →In XO sex determination, a male forms when the egg meets a sperm thatRead the answer and worked solution →The haploid number of chromosomes in a male honey bee drone isRead the answer and worked solution →Male honey bees form sperm by which type of cell division?Read the answer and worked solution →A honey bee drone has no father but has a grandfather. This follows from which system?Read the answer and worked solution →Mutation is best defined as a change in theRead the answer and worked solution →Which of these is a physical mutagen mentioned for causing mutations in organisms?Read the answer and worked solution →Why is pedigree analysis used for human inheritance studies?Read the answer and worked solution →Mendelian disorders are mainly caused by alteration inRead the answer and worked solution →Genetic disorders are grouped broadly into Mendelian disorders andRead the answer and worked solution →Haemophilia is inherited as which type of trait?Read the answer and worked solution →A woman who carries the colour blindness gene has a son. His chance of being colour blind isRead the answer and worked solution →Whose family pedigree shows many haemophilic descendants because she was a carrier?Read the answer and worked solution →Which genotype shows the diseased phenotype in sickle-cell anaemia?Read the answer and worked solution →In sickle-cell anaemia, which amino acid replaces glutamic acid at position six of the beta globin chain?Read the answer and worked solution →The sixth codon of the beta globin gene changes in sickle-cell anaemia fromRead the answer and worked solution →

Worked practice questions

The law of dominance explains which F2 proportion in a monohybrid cross?

  1. 1:2:1
  2. 9:3:3:1
  3. 3:1
  4. 1:1
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Correct answer: C. 3:1

Dominance accounts for the expression of one parental character in F1 and the 3:1 dominant to recessive ratio in F2.

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In snapdragon, the F2 phenotype ratio from selfed pink F1 plants is

  1. 3 red : 1 pink : 1 white
  2. 2 red : 1 pink : 1 white
  3. 1 red : 1 pink : 2 white
  4. 1 red : 2 pink : 1 white
Show answer and solution

Correct answer: D. 1 red : 2 pink : 1 white

Incomplete dominance keeps the 1:2:1 genotype ratio visible in the phenotypes, so heterozygotes look pink.

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Why does the heterozygous snapdragon Rr flower look pink rather than red?

  1. R is incompletely dominant
  2. r is fully dominant
  3. Both alleles are lost
  4. A new mutation occurs
Show answer and solution

Correct answer: A. R is incompletely dominant

Because R is incompletely dominant, the Rr plant shows an intermediate colour between red and white parents.

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