Tamil Nadu SSLC (Class 10) Genetics — practice questions
25 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice Tamil Nadu SSLC (Class 10) Genetics in the app →In Mendel's monohybrid cross between a pure tall and a pure dwarf pea plant, what is the phenotypic ratio obseWhat is the genotypic ratio obtained when a heterozygous tall pea plant (Tt) is self-pollinated?A pea plant has the genotype Tt for stem length. The state of having two unlike alleles for a trait is best deWhich term refers to the external, observable expression of a particular trait in an organism?In Mendel's dihybrid cross with round-yellow and wrinkled-green seeds, what is the phenotypic ratio of the F2 In a dihybrid cross, the 9 : 3 : 3 : 1 phenotypic ratio of the F2 generation is a direct demonstration of whicA homozygous round-yellow pea plant (RRYY) is crossed with a homozygous wrinkled-green plant (rryy). What is tWhen the F1 hybrid pea plants form gametes, the two alleles of a single gene separate so that each gamete carrTwo factors that form a pair and control the alternative forms of a single contrasting character are together A segment of DNA that is responsible for the inheritance of a particular phenotypic character is called what?The specific fixed position occupied by a gene on a chromosome is known as its what?During cell division, the spindle fibres attach to the chromosome at a specific region. What is this region caA chromosome in which the centromere lies exactly in the centre, forming two equal arms and a V shape, is clasA normal human body cell contains 23 pairs of chromosomes. How many of these pairs are autosomes?According to the Watson and Crick model, the nitrogenous base adenine always pairs with which base?One strand of a DNA molecule has the base sequence A-G-C-T. What will be the complementary base sequence on thEach nucleotide of a DNA molecule is made up of three components. Which set correctly lists all three?During DNA replication, the short DNA segments synthesised on the lagging strand are joined together by which Which enzyme binds at the origin of replication and separates the two strands of the DNA molecule during repliIn humans, the sex of a child is determined by the type of sex chromosome carried by which gamete?If an egg carrying X fuses with a sperm carrying Y, what will be the sex chromosome make-up and sex of the resIn the context of human sex chromosomes, why is the human female described as homogametic?Down's syndrome in humans is caused by the presence of an extra copy of which chromosome?The gain or loss of one or more chromosomes from a normal set, as seen in Trisomy and Monosomy, is called whatSickle cell anaemia results from a change in the nucleotide sequence of a single gene. This kind of change is