Description : 27. A ‘single step-large mutation’ is known as ... b) Branching descent b) Natural Selection c) Saltation d) Gene Migration
Last Answer : c) Saltation
Description : Assertion :- Branching descent and Natural selection are the two key concepits of Darwinian theory of evolution. Reason :- Darwinism is able to explai
Last Answer : Assertion :- Branching descent and Natural selection are the two key concepits of Darwinian theory of ... D. If both Assertion & Reason are false.
Description : A specific BRCA1 cancer-predisposing gene mutation seems to occur more frequently among women of which descent? a) Ashkanazi Jewish Expression of the BRCA1 gene is an example of ... of treatment for tuberculosis) are at significantly increased risk for developing isoniazid-induced hepatitis.
Last Answer : a) Ashkanazi Jewish Expression of the BRCA1 gene is an example of inheritance in the development of breast cancer.
Description : _______________ acts to inhibit reproductive isolation. A) Mutation B) Natural selection C) Genetic drift D) Gene flow
Last Answer : D) Gene flow
Description : Assertion :- According to Hugo de Vries , it is mutation which causes speciation and hence called it saltation. Reason :- Mutations are random and dir
Last Answer : Assertion :- According to Hugo de Vries , it is mutation which causes speciation and hence called it ... . D. If both Assertion & Reason are false.
Description : Branching descent is accoured for:
Last Answer : Branching descent is accoured for: A. Homology B. Analogy C. Vestigal organs D. Atavism
Description : Evolution of different species in a given area starting from a point and spreading to other geographical areas is known as (1) Divergent evolution (2) Adaptive radiation (3) Natural selection (4) Migration
Last Answer : Adaptive radiation
Description : Condition #2 of Darwin's Theory of Natural Selection by Descent with Modification states?
Last Answer : Most of the differences found within a species are passed down from parents to their offspring.
Description : Condition #1 of Darwin's Theory of Natural Selection by Descent with Modification states?
Last Answer : Individuals within a population have differences.
Description : Single seed descent method of selection is a modification of- a. Mass selection b. Pure line selection c. Pedigree method d. Bulk method
Last Answer : d. Bulk method
Description : According to Hugo de Vries, the mechanism of evolution is :- (1) Multiple step mutations (2) Saltation (3) Phenotypic variations (4) Minor mutations
Last Answer : (2) Saltation
Description : Industrial melanism is an example of (a) mutation (b) Neo-Lamarckism (c) Neo-Darwinism (d) natural selection.
Last Answer : (d) natural selection.
Description : The desired varieties of economically useful crops are raised by (a) vemalisation (b) mutation (c) natural selection (d) hybridisation
Last Answer : (d) hybridisation
Description : The desired varieties of economically useful crops are raised bya) Vernalization b) Mutation c) Natural selection d) hybridisation
Last Answer : d) hybridisation
Description : Which type of Mendelian inherited condition results in both genders being affected equally in a vertical pattern? a) Automosomal dominant inheritance An individual who has an autosomal dominant ... that combine during early embryonic development leading to incomplete closure of the neural tube.
Last Answer : a) Automosomal dominant inheritance An individual who has an autosomal dominant inherited condition carries a gene mutation for that condition on one chromosome of a pair.
Description : Nondisjunction of a chromosome results in which of the following diagnoses? a) Down Syndrome When a pair of chromosomes fails to separate completely and creates a sperm or oocyte that contains two ... genetic condition that may occur in a single family member as a result of spontaneous mutation.
Last Answer : a) Down Syndrome When a pair of chromosomes fails to separate completely and creates a sperm or oocyte that contains two copies of a particular chromosome (nondisjunction) Down syndrome results from three number 21 chromosomes.
Description : Movement of people from a village to a small town and later to a city is known as : (1) infra-state migration (2) step-wise migration (3) inter-state migration (4) forced migration
Last Answer : (2) step-wise migration Explanation: Step wise migration refers to a type of migration which occurs in a series of movements, for example, moving to a town larger than the home town, but not directly to one of the city regions. It is an important subcomponent of the urbanward drift of people.
Description : Variation in gene frequencies within populations can occur by chance rather than by natural selection. This is referred to as Or Random unidirectional
Last Answer : Variation in gene frequencies within populations can occur by chance rather than by natural selection. ... flow C. Genetic drift D. Random mating
Description : If a gene mutation prevents formation of an enzyme normally used by a lysosomes, a disease may result known as (A) Lysosomal abstracted disease (B) Lysosomal secretory disease (C) Lysosomal storage disease (D) All A, B and C
Last Answer : (C) Lysosomal storage disease
Description : The new varieties of plants are produced by (a) introduction and mutation (b) selection and introduction (c) selection and hybridization (d) mutation and selection.
Last Answer : (c) selection and hybridization
Description : A plant breeder: waists to develop a disease resistant variety. What should he do first?(a) Hybridisation (b) Mutation (c) Selection (d) Production of crop
Last Answer : (c) Selection
Description : The quickest method of plant breeding is — a. Mutation breeding b. Back cross c. Heterosis breeding d. Selection
Last Answer : a. Mutation breeding
Description : Which of the following(s) is/are found in Genetic Algorithms? (i) evolution (ii) selection (iii) reproduction (iv) mutation (a) i & ii only (b) i, ii & iii only (c) ii, iii & iv only
Last Answer : (a) i & ii only
Description : A plant breeder: waists to develop a disease resistant variety. What should he do first? a) Hybridisation b) Mutation c) Selection d) Production of crop
Last Answer : c) Selection
Description : In wind erosion floating of less than 0.1 mm soil particle is observed in — stage a. Saltation b. Surface creep c. Suspension d. None of these
Last Answer : c. Suspension
Description : Saltation is a process of _____ erosion a. Water b. Wind c. Both a & b d. None of these
Last Answer : b. Wind
Description : What is a “saltation velocity” and how is it used in designing pneumatic conveying systems?
Last Answer : The saltation velocity is defined as the actual gas velocity (in a horizontal pipe run) at which the particles of a homogeneous solid flow will start to fall out of the gas stream. In designing, the ... 2.5 while the factor could be as high as five for course particles such as soybeans could.
Description : The saltation of sand grains refers to the sand grains: w) being coated with salt x) moving in jumps and bounces y) moving in a steady stream z) being cemented together
Last Answer : ANSWER: X -- MOVING IN JUMPS AND BOUNCES
Description : What is gene mutation? -Biology
Last Answer : answer:
Description : A point mutation occurs in a sex cell of an adult chimpanzee. The mutation is located on a gene responsible for the development of the eye. Which describes the most likely effect of this mutation?
Last Answer : The chimpanzee's offspring will have abnormal eyes.
Description : How does a mutation in a gene affect the order of DNA based?
Last Answer : A mutation in a gene can happen by addition, deletion orsubstitution of base pairs. This means that the order of the baseswill change- a new base may be added, a base may be lost, or onebase ... occurs in a sex cell, themutation can be passed on to an offspring and affect theoffspring's phenotype.
Description : How is it possible for a point mutation to have no effect on the function of the gene TAC CG?
Last Answer : Feel Free to Answer
Description : Cancer cells may become resistant to amethopterin by (A) Developing mechanisms to destroy amethopterin (B) Amplification of dihydrofolate reducatse gene (C) Mutation in the dihydrofolate reductase ... is no longer inhibited by amethopterin (D) Developing alternate pathway of thymidylate synthesis
Last Answer : Answer : B
Description : All the following statements about retino blastoma are true except (A) At least two mutations are required for its development (B) One mutation can be inherited from a parent (C) Children ... mutation develop retinoblastoma at a younger age (D) RB 1 gene promotes the development of retinoblastoma
Last Answer : Answer : D
Description : Retinoblastoma can result from a mutation in (A) ras proto-oncogene (B) erbB proto-oncogene (C) p 53 gene (D) RB 1 gene
Description : Ras proto-oncogene is converted into oncogene by (A) A point mutation (B) Chromosomal translocation (C) Insertion of a viral promoter upstream of the gene (D) Gene amplification
Last Answer : Answer : A
Description : Marfan’s syndrome results from a mutation in the gene coding: (A) Collagen (B) Elastin (C) Fibrillin (D) Keratin
Description : When one gene pair hides the effect of the other unit, the phenomenon is referred to as: (1) Epistasis (2) Mutation (3) None of the options (4) Dominance
Last Answer : (1) Epistasis Explanation: Epistasis refers to the phenomenon in which one gene hides the effect of the other. In other word, it does not allow the other gene to express itself. This is counterpart of ... may be in one direction only meaning that ei-ther A hides the effect of B or vice versa.
Description : Gamma rays can cause – (1) gene mutation (2) sneezing (3) burning (4) fever
Last Answer : (1) gene mutation Explanation: In molecular biology and genetics, mutations are accidental changes in a genomic sequence of DNA: the DNA sequence of a cell's genome or the DNA or RNA ... viruses, transposons and mutagenic chemicals, as well as errors that, occur during meiosis or DNA replication.
Description : Which enzyme will be produced in a cell if there is a nonsense mutation in the lac Y gene? (a) Transacetylase (b) Lactose permease and transacetylase (c) β-galactosidase (d) Lactose permease
Last Answer : β-galactosidase
Description : A gene pair hides the effect of another gene. The phenomenon is called (a) dominance (b) segregation (c) epistasis (d) mutation
Last Answer : (c) epistasis
Description : A heritable change in DNA is called a ______. a. mistake b. mutation c. gene d. pathogen
Last Answer : b. mutation
Description : The origin of a new species first requires A) reduced gene flow. B) increased gene flow. C) reduced mutation rates. D) increased mutation rates.
Last Answer : A) reduced gene flow.
Description : The type of gene interaction in which the effects of one gene override or mask the effects of other entirely different genes is called: a) linkage b) mutation c) pleitropy (pron: ply-ah-tropy) d) epistasis (pron: eh-pis-te-sis)
Last Answer : ANSWER: D -- EPISTASIS
Last Answer : Epistasis
Description : Gamma rays can cause (1) gene mutation (2) sneezing (3) burning (4) fever
Last Answer : gene mutation
Description : Why is variation overproduction adaptation and descent necessary for natural selectoin?
Last Answer : What is the answer ?
Description : Single seed descent method is a method of
Last Answer : Ans. Method of Self pollination
Description : The branching enzyme acts on the glycogen when the glycogen chain has been lengthened to between glucose units: (A) 1 and 6 (B) 2 and 7 (C) 3 and 9 (D) 6 and 11
Last Answer : D