CBSE Class 12 Principles Of Inheritance — practice questions
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Practice CBSE Class 12 Principles Of Inheritance in the app →In Mendel's monohybrid cross of tall × dwarf pea plants, the phenotypic ratio in the F₂ generation wasA tall pea plant is crossed with a dwarf plant. Half the offspring are tall and half are dwarf. The genotype oThe genotypic ratio in the F₂ of a monohybrid cross between Tt × Tt isA cross between true-breeding red (RR) and true-breeding white (rr) snapdragons gives pink F₁ plants. This patA person with blood group AB has genotypeThe ABO blood-group system is an example ofThe phenotypic ratio in the F₂ of a Mendelian dihybrid cross (with two independently assorting genes) isMendel's Law of Independent Assortment is best illustrated by the F₂ ratioMorgan's discovery of linkage in Drosophila showed thatIf two genes on the same chromosome show a recombination frequency of 1%, they are approximatelyA trait controlled by three or more genes whose effects add up, producing a continuous range of phenotypes, isIn humans, the sex of a child is determined at fertilisation byIn honey bees, drones (male bees) develop fromHaemophilia and colour blindness are inherited asMendel conducted his classic genetics experiments using:In a monohybrid cross of Tt × Tt, the F2 PHENOTYPIC ratio is:In a DIHYBRID cross of YyRr × YyRr, the F2 phenotypic ratio is:In snapdragon (Antirrhinum), RR (red) × rr (white) gives F1 plants that are PINK. This pattern is called:In the human ABO blood group system, a person with blood group AB has the genotype:The sex of a human baby is determined by:Sickle cell anaemia is caused by:Down syndrome is most commonly caused by:Haemophilia and colour blindness are MORE COMMON in MALES than females because they are:Mendel conducted his hybridisation experiments on:For how many years did Mendel run his experiments?Mendel's experiments ran from 1856 until:Mendel was the first to apply to problems in biology:How many true-breeding pea varieties did Mendel select?Crossing a tall pea plant with a dwarf one gives an F1 that is:The F2 ratio in a monohybrid cross is:Crossing an organism with its recessive parent type is called a:In Antirrhinum, a red-flowered plant crossed with white gives an F1 that is:The pink F1 of Antirrhinum is an example of:The F2 phenotype ratio under incomplete dominance is:When the F1 generation resembles both parents, this is:Co-dominance in humans is well shown by:The F2 ratio in a dihybrid cross is:Who proposed the chromosomal theory of inheritance?Morgan carried out his crosses using:A heterozygous female for haemophilia is called a:In sickle-cell anaemia the red cell changes from a biconcave disc to a:Down's syndrome results from an extra copy of chromosome:Turner's syndrome in human females results from the loss of:The gain or loss of a single chromosome is called:How many chromosomes are there in a normal human cell?