TS EAMCET Genetics — practice questions
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Practice TS EAMCET Genetics in the app →For how many years did Mendel carry out his garden pea hybridisation experiments?How many true-breeding pea varieties did Mendel select for his crosses?The first hybrid generation obtained from a cross is called theSlightly different forms of the same gene that code for contrasting traits are termedThe descriptive terms 'tall' and 'dwarf' refer to the plant'sA Tt pea plant looks exactly like TT because T isA cross between TT and tt pea plants is an example of aWho devised the Punnett square for predicting genotypes of offspring?The F2 phenotypic ratio in a monohybrid cross with complete dominance isA test cross crosses an individual of unknown dominant phenotype withWhich law explains why recessive traits reappear in F2 without blending?A homozygous parent produces gametes that areSelfing pink snapdragons gives red, pink and white in the ratioIn codominance, the F1 hybridThe ABO blood groups are controlled by gene I with how many alleles?Genotype IAIB gives blood group AB because the alleles areMultiple alleles can be detected only byMendel's pea cross of yellow round with green wrinkled gave F1 seeds that wereThe dihybrid F2 phenotype ratio isThe Mendelian 9:3:3:1 can be obtained by combining twoAn RrYy plant produces how many types of gametes?The F2 Punnett square of a dihybrid cross has how many boxes?Mendel's work was ignored untilWho first noticed that chromosome behaviour parallels gene behaviour?Drosophila suits genetic work partly because its life cycle takes aboutThe term 'linkage' was coined byGeneration of non-parental gene combinations is termedRecombination between the white and yellow genes of Drosophila was onlyTraits controlled by three or more genes, like human height, areIn a polygenic trait the effect of each allele isHenking named the chromosome-like structure seen in insect sperm theIn birds, the heterogametic sex is theA honey bee drone develops fromHow many chromosomes does a honey bee drone have?Agents such as UV radiation that induce mutations are known asStudying a trait over several generations of a family is calledRed-green colour blindness affects about what share of males?The pedigree of which queen showed several haemophilic descendants?Sickle-cell anaemia results from replacing glutamic acid withSickle-cell anaemia arises from a base change at the sixth codon from GAG toPhenylketonuria patients lack an enzyme that converts phenylalanine intoBeta thalassemia is controlled by gene HBB on chromosomeFailure of cytokinesis after telophase leads toDown's syndrome is caused by trisomy of chromosomeThe biochemical nature of DNA's role came after Friedrich Miescher called itWhich pair of bases belong to the purines?Adenine pairs with thymine through how many hydrogen bonds?Chargaff observed that in double-stranded DNA the ratio of A to T and G to C isCentral dogma states that information flowsHistones are rich in the basic amino acidsA histone octamer contains how many histone molecules?In prokaryotes the DNA lies in a region called theHershey and Chase used which labels to tag viral DNA and protein?According to the RNA world idea, the first genetic material wasThe experiment proving semiconservative replication usedTaylor's semiconservative proof in eukaryotes used which plant?In eukaryotes DNA replication occurs in theCopying genetic information from DNA into RNA is calledA transcription unit is defined by a promoter, a structural gene and aThe strand that serves as the template in transcription runsThe promoter provides a binding site forSequences that appear in mature RNA are calledWhich factor lets bacterial RNA polymerase initiate transcription?Introns are removed from hnRNA byHow many codons are generated by triplet combinations of four bases?Who proposed that the genetic code must be made of three nucleotides?Which scientist developed chemical methods to make defined RNA sequences for decoding?How many codons do not code for any amino acid?Which set contains only stop codons?The adapter molecule that reads the code and carries amino acids isThe real three-dimensional shape of tRNA resembles anThe cellular factory for protein synthesis is theCharging of tRNA needs which energy source?Which stage ends when a release factor binds the stop codon?Which gene of the lac operon increases cell permeability to beta-galactosides?In HGP, the vectors for cloning DNA fragments in yeast wereWhich human chromosome has the most genes?What fraction of the human genome codes for proteins?Single-base DNA differences among humans are calledThe largest known human gene is