Genetics. I Name the following: 1. It is the mechanism of inheritance of characters from the parental generation to the offspring.

Transcription

1 Grade Subject Topic : HS : Science : Genetics Genetics I Name the following: 1. It is the mechanism of inheritance of characters from the parental generation to the offspring Differences shown by individual organisms within the same species and in their offspring are called as Father of modern genetics In a cross involving one pair of contrasting characters, only one character which expresses itself in the next generation Genotypic ratio in the F2 generation of a monohybrid cross April 23, 2013 Page 1 of 10

2 6. It is a cross involving the F1 hybrid with its recessive parental combination :3:3:1 is the phenotypic ratio in the F2 generation of a which type of cross The chromosome theory of inheritance was proposed by whom? An intragenic interaction where both the alleles of a given trait express as a blend (mixture) and One allele is not dominant over the other A Condition where more than two genes occupy the same locus on a pair of homologous chromosomes April 23, 2013 Page 2 of 10

3 11. Above diagram shows that Chromosomes can be are distinguished on the basis of the position of the. 12. The offspring is said to before that trait when it inherits different alleles from both parents. 13. Duplicated chromosome are also called as. 14. It is where RNA polymerase binds to the DNA and initiates transcription during Gene regulation. 15. Disorder in which males have an extra X chromosome and the genotype for males with this disorder is XXY. April 23, 2013 Page 3 of 10

4 II Multiple choice Question - i) What was the main idea of blending theory of inheritance? a) the characters of the two parents mix and express in the offspring b) the traits of parents are passed to offspring through gametes. c) both a and b d) None of these ii) Mendel choose pea plants for his experiments because a) Pea plants exhibited self-pollination under natural b) Duration of life cycle was very long c) They produced small number of seeds d) These plants were easily available. iii) In a monohybrid cross, the genes responsible for the two contrasting characters stay together in the F1 generation but separate during the formation of gametes. Which Law states this? April 23, 2013 Page 4 of 10

5 a) Law of Dominance b) Law of Independent Assortment c) Law of Segregation iv) Phenotype is the external expression of a hereditary character. a) True b) False. v) Diagram below shows what type of cross. a) Monohybrid Cross b) Dihybrid Cross April 23, 2013 Page 5 of 10

6 c) None of these vi) Why is it easier to analyse the pattern of polygenic inheritance in plants than in animals? a) Life span of plants is short b) They have more progny c) Controlled mating can be performed. vii) In four O clock plants red color ( R ) incompltely dominant over white (r), the heterozygous having pink color. What will be the offspring in a cross between red flower and a pink flower? Genotype of Red flower - RR Genotype of white flower - rr a) 50% : 50% b) 60% : 40% c) 25 % : 75% viii) What is meant by promoter gene? a) Portion of DNA to which the molecules of RNA polymerase are found attached. April 23, 2013 Page 6 of 10

7 b) Portion of DNA to which the molecules of trna are found attached. c) Portion of RNA to which the molecules of DNA are found attached. d) None of the above ix) genes that cause cancer known as a) Oncogenes b) Ocogenes c) Operator genes d) Cancer genes x) An is a chemical substance which inactivates the repressor protein by binding with it and there by induces protein synthesis in the structural genes is called a) Inducer b) Producer c) Activator d) Promotor xi. How many pair of chromosomes are found in human? a) 24 pairs b) 26 pairs April 23, 2013 Page 7 of 10

8 c) 23 pairs d) 30 pairs xii entromere is a part of the chromosome tht holds the two chromatids together. a)true b) False xiii It is a double stranded helical polynucleotide molecule. a) DNA b) RNA c) PNA d) rrna when One or more nucleotides of the gene are removed,it is called as a)deletion b)duplication c) Inversion d) Insertion Main cause of mutation is April 23, 2013 Page 8 of 10

9 a) Any error during DNA replication can result in mutation. b) Agents like ultraviolet light (sunshine), nuclear radiation, chemicals and viruses can cause mutations. c) Some mutations occur spontaneously. e) All of the Above xvi Which of the following process takes place in Transduction (gene transfer) in bacteria? a) genetic material is transferred with the help of a Bacteriophage b) The genetic material from one cell is transferred to another cell directly. c) A bacterial cell takes up isolated DNA molecules from the medium surrounding it. xvii Form of inheritance in which one allele for a specific trait is not completely dominant over the other allele is April 23, 2013 Page 9 of 10

10 a) Incomplete recessiveness b) Incomplete Dominance c) Independent assortment d) None of the above xviii Below is the diagram of Flow of Biological Information in an Organism. It shows a) One way flow of information b) Two way flow of information c) Intermediatary flow April 23, 2013 Page 10 of 10