Day: July 9, 2023

Question 1.If a genetic disease is transferred from a phenotypically normal but carrier female to only some of the male progeny, the disease is(a) autosomal dominant(b) autosomal recessive(c) sex-linked dominant(d) sex-linked recessive. Answer:(d) sex-linked recessive.   Question 2.In sickle cell anaemia glutamic acid is replaced by valine. Which one of the following triplets codes for valine ?(a) GGG(b) A AG(c) G A A(d) GUG Answer:(d) GUG   Question 3.Person having genotype IA IB would show the blood group as AB. This is because of(a) pleiotropy(b) co-dominance(c) segregation(d) incomplete dominance. Answer:(b) co-dominance   Question 4.ZZ/ZW type of sex determination is seen

Question 1.Ovulation in the human female normally takes place during the menstrual cycle(a) at the mind secretory phase(b) just before the end of the secretory phase(c) at the beginning of the proliferative phase(d) at the end of the proliferative phase. Answer:(d) at the end of the proliferative phase.   Question 2.After ovulation Graafian follicle regresses into(a) corpus atresia(b) corpus callosum(c) corpus luteum(d) corpus albicans Answer:(c) corpus luteum   Question 3.Immediately after ovulation, the mammalian egg is covered by a membrane known as(a) chorion(b) zona pellucida(c) corona radiata(d) vitelline membrane. Answer:(c) corona radiata   Question 4.Which one of the following events

Question 1.What is the function of filiform apparatus in an angiospermic embryo sac?(a) Brings about opening of the pollen tube(b) Guides the pollen tube into a synergid(c) Prevents entry of more than one pollen tube into a synergid(d) None of these Answer:(b) Guides the pollen tube into a synergid Question 2.The female gametophyte of a typical dicot at the time of fertilisation is(a) 8 – celled(b) 7 – celled(c) 6 – celled(d) 5 – celled Answer:(b) 7 – celled Question 3.Polygonum type of embryo sac is(a) 8 – nucleate, 7 – celled(b) 8 – nucleate, 8 – celled(c) 7 –

1. The segregation of alleles on one trait did not have any effect on the segregation of alleles on a different trait. This is based on ____________a) Mendel’s law of Heredityb) Mendel’s law of Dominancec) Mendel’s law of Independent Assortmentd) Mendel’s law of Segregation Answer: cExplanation: There are three Mendel’s laws n Heredity. 1. The Mendel’s law of Dominance states that when a dominant individual is crossed with a recessive individual, the F1 generation offspring will exhibit the dominant trait. 2. According to Mendel’s law of Segregation, a pair of allele governing a single trait segregates from each other during

1. Why are enzymes required?a) Enzymes help to yield more productb) Enzymes increase the activation energy of the reactionc) Enzymes decrease the activation energy of the reactiond) Enzymes maintain the equilibrium in the reaction Answer: cExplanation: Chemical reactions need certain covalent bond breakage within the reactants. For this, the reactants must contain sufficient kinetic energy called the activation energy. Enzymes act as catalysts that speed up the reaction by lowering the activation energy required for breaking the covalent bonds. 2. Competitive enzyme inhibitors are ________a) Reversible inhibitorsb) Irreversible inhibitorsc) Permanent inhibitorsd) None of the mentioned Answer: aExplanation: Irreversible inhibitors are