TS EAMCET Principles of Inheritance and Variation — practice questions
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Practice TS EAMCET Principles of Inheritance and Variation in the app →Mendel conducted his hybridisation experiments on which plant?Mendel selected pea plants with how many pairs of contrasting traits?In Mendel's monohybrid cross between true-breeding tall (TT) and dwarf (tt) plants, the F₂ phenotypic ratio waThe F₂ **genotypic** ratio in Mendel's monohybrid cross is:Mendel's Law of Independent Assortment is best illustrated by the F₂ phenotypic ratio of:The ABO blood-group gene (I) has how many alleles in the human population?A person with blood group AB has the genotype:A person with blood group O has the genotype:Thomas Hunt Morgan used which model organism for his genetic studies?In humans, the sex-determination mechanism is:In grasshopper, the sex-determination mechanism is:In birds, the sex-determination mechanism is:Which of the following is a mutagen?Sickle-cell anaemia is a:β-Thalassemia is controlled by which gene?Down's syndrome is caused by:Klinefelter's syndrome is characterised by the karyotype:Turner's syndrome results from the karyotype:Aneuploidy refers to:Polyploidy refers to:In a monohybrid cross Tt × Tt, the phenotypic ratio in F2 is:Genotypic ratio of a monohybrid F2 (Tt × Tt):Phenotypic ratio in dihybrid F2 cross (RrYy × RrYy):ABO blood groups: an individual with genotype I^A i has blood type:A man with blood type AB marries a woman with blood type O. What blood types can their children have?Brown eyes (B) is dominant over blue (b). Bb father × bb mother. Probability of blue-eyed child:In a pedigree, a horizontal line connecting two individuals represents:Pleiotropy refers to:4 O'clock plant flower color shows incomplete dominance: RR (red) × rr (white) → Rr (pink). F2 phenotypic ratiLinkage map distance of 1 cM (centimorgan) corresponds to:When Mendel crossed pure tall and dwarf pea plants, what were the F1 plants like?In the F2 of a monohybrid cross, TT, Tt and tt plants occur in what proportion?What are alleles?Which statement describes a true-breeding dwarf pea plant?A test cross mates a dominant-looking plant withA tall pea plant of genotype Tt is test crossed. What phenotypic ratio is expected in the progeny?Who developed the Punnett square to calculate genotype probabilities in a cross?Mendel's Second Law is known as the law ofAccording to the law of segregation, what does a gamete receive?What gametes does a heterozygote like Tt form?True-breeding red and white snapdragons are crossed. What is the colour of the F1 plants?What phenotypic ratio results in the F2 of a snapdragon red x white cross?In co-dominance, what does the F1 generation show?How many alleles of gene I control the human ABO blood groups?How many different genotypes are possible for the human ABO blood types?A person with genotype IAIB has red blood cells carrying which sugars?What is true about the i allele of the ABO blood group gene?What phenotypic ratio is obtained in the F2 of a dihybrid cross by Mendel?Pure round yellow x pure wrinkled green peas give F1 plants that areHow many types of gametes does an RrYy plant produce?How many squares does the Punnett square for the F2 of a dihybrid cross contain?Which law states that segregation of one pair of characters is independent of another pair?In Mendel's dihybrid cross, which combination of seed traits was seen in all F1 seeds?Who rediscovered Mendel's work in 1900?Why was Mendel's work first rejected?Who proposed the chromosomal theory of inheritance by uniting chromosome behaviour with Mendel's principles?Which scientist and group experimentally verified the chromosomal theory using fruit flies?About how long does the Drosophila life cycle take to complete?Which term did Morgan coin for the physical association of genes on a chromosome?Recombination generates which gene combinations?In Drosophila, the genes yellow and white showed what percentage of recombination?Which gene pair in Drosophila was more loosely linked?Who used recombination frequency between genes to map their positions on a chromosome?Traits such as human height that are controlled by three or more genes are calledIn polygenic inheritance, how does each allele affect the phenotype?With skin colour set by genes A, B, C, which genotype is intermediate?A single gene that shows multiple phenotypic effects is called aWhich enzyme gene is mutated in phenylketonuria?What did Henking name the nuclear structure that only half the sperm received?In grasshoppers, which sex has only one X chromosome besides the autosomes?In humans and Drosophila, which sex carries one X and one Y chromosome?In many birds, which sex has two dissimilar sex chromosomes ZW?A change in the DNA sequence that alters the genotype and phenotype is called aA change in a single base pair of DNA is known as aWhich genetic disorder is the classical example of a point mutation?Deletion or insertion of base pairs in DNA causes which kind of mutation?Which of these is a physical mutagen that can cause mutations in organisms?What is pedigree analysis?Mendelian disorders are mainly caused by alteration inWhich of these is an X-linked recessive disorder?Which clotting-related feature marks haemophilia?Whose family pedigree shows several haemophilic descendants due to a carrier?About what percentage of males show red-green colour blindness?Why is colour blindness far more common in males than in females?A carrier woman has a son. What is his chance of being colour blind?In sickle-cell anaemia, which amino acid replaces glutamic acid in the beta globin chain?Which genotype shows the diseased phenotype of sickle-cell anaemia?The sickle-cell mutation is a single base substitution from which codon change?A person lacking the enzyme that converts phenylalanine into tyrosine suffers fromGain or loss of one or a few chromosomes due to failed chromatid segregation is calledDown's syndrome results from an extra copy of which chromosome?Turner's syndrome arises from which change?Failure of cytokinesis after telophase leads to which condition, often seen in plants?How many pairs of autosomes does a normal human cell have?Roughly how many pea plants did Mendel cultivate and test in his experiments?Two heterozygous parents (Bb x Bb) are crossed. What fraction of offspring is homozygous recessive?During which stage does independent assortment of chromosomes occur?How many chromosome combinations are possible in human gametes through independent assortment?Pure dominant x pure recessive gives offspring that areA Mendelian trait depends on which of the following?What did Mendel conclude about the dwarf F2 plants?In a dihybrid cross F2, what is the ratio of yellow to green seeds?A recessive trait usually appears because the modified allele makesThe word chromosome literally refers to