Class 10 Biology – HeredityPost author:sriwiszy.inPost published:9 February 2024Post category:BlogPost comments:0 Comments Welcome to your Class 10 heredity and Evolution-biology 1. Which of the following is true about chromosomes? Two germ cells combine to restore the normal number of chromosomes in the progeny. All of the above. Separate independent pieces responsible for variations is called a chromosome. Each cell will have two copies of each chromosome, one each from the male and female parents. None 2. The only progressive trend in evolution seems to be that more and more ____________ body designs have emerged overtime. Both A and B Complex Simple None of the above None 3. A pea plant with yellow and round seeds is crossed with another pea plant with green and wrinkled seeds that produced 49 yellow round and 49 yellow wrinkled seeded pea plants. The genotype of parent plant with yellow round seeds must be: YyRR YYRr yyRr Yyrr None 4. In humans, sex is determined by :I. 22 pairs of chromosomes which are exactly alike in male and female II. A pair of sex chromosomes III. Egg with single set of chromosome IV. Genetic make up of a sperm I, III and IV II & IV III & IV II, III and IV None 5. A pure dominant pea plant producing round yellow seeds is crossed with pure recessive pea plant producing wrinkled green seeds. The number of plants bearing round green seeds in the F1 generation of Mendel's experiment is: 3 1 0 9 None 6. Among the following which is not one of the direct conclusion that can be drawn from Mendel's experiment? Only one parental trait is expressed in F 1 generation. Natural selection can alter frequency of an inherited trait. Two copies of each trait is inherited in sexually reproducing orgainsm For recessive trait to be expressed, both copies should be identical. None 7. The phenomenon where individuals of a species exhibit differences in characteristics are called: Evolution Adaptation Variation All of the above None 8. The characteristics of the second generation organisms produced asexually will be Completely similar Some will be unique while others will be similar due to inheritance Comparatively similar All of the above None 9. How are variations created? Because DNA copying mechanism is not accurate Because DNA copying mechanism is 100% accurate Because transcription of mrna from DNA is not accurate Both A and B None 10. Mendel's experiments on dihybrid cross was based on Tall plant, red flower x dwarf plant, white flower Tall plant yellow flower x dwarf plant, white flower Green cotyledon, round seed x yellow cotyledon, wrinkled seed Yellow cotyledon, round seed x green cotyledon, wrinkled seed None 11. inhabit the most in hospitable habitats like hot springs, deep-sea thermal vents and the ice in Antarctica. 12. The sequence of gradual changes which takes place in the primitive organisms over millions of years in which new species are produced is known as Variation Evolution Inheritance None of the above None 13. Which of the following statements (A - E) are wrong:A. Mendel is called the 'Father of Genetics.'B. The simplest cross conducted by Mendel is the dihybrid cross.C. The dominant trait for the visible character seed colour selected by Mendel is green.D. The first generation offspring is also represented as pure breeding.E. Mendel's experiments are based on the cross-breeding of two plants of pea differing from each other. B and D only B and E only C, D and E B, C and D None 14. Mendel's experiments on dihybrid cross was based on Green cotyledon, round seed x yellow cotyledon, wrinkled seed Tall plant, red flower x dwarf plant, white flower Tall plant yellow flower x dwarf plant, white flower Yellow cotyledon, round seed x green cotyledon, wrinkled seed None 15. Inheritance from the previous generation provides Only subtle changes in it in the common body design Both A and B None of the above Only a common basic body design None 16. A brown-eyed couple has a blue-eyed child. The trait of brown eye (B) is dominant over that of blue-eyed (b). What is the genotype of the couple? Bb × Bb BB × Bb BB × bb BB × BB None 17. What are the main theories about how humans got to the America? None of the above Humans went by planes. Humans walked across the continent of Pangea. Humans were always in the America. None 18. The two versions of a trait (character) which are brought in by the male and female gametes are situated on Any chromosome Sex chromosomes Copies of the same chromosome Two different chromosomes None 19. In 1952, when still a graduate student, he circulated water, ammonia, methane and hydrogen, pass an electric discharge to simulate lightning and got complicated molecules associated with life such as amino acids. This experiment was one of the first great experiments which proved that life indeed could arise from non-living matter. Who was this scientist? Stanley Lloyd Miller Donald Arthur Glaser Murray Gell-Mann Carl Sagan None 20. Due to Starvation if beetles have low body weight then this character is transfer to the next generation or not it is based on 21. Mendel's Law of independent assortment stated that: The segregation of alleles for one gene occurs independently to that of any other gene. Recessive alleles will be masked by dominant alleles. When gametes form, alleles are separated so that each gamete carries only one allele for each gene. The segregation of alleles for one gene occurs dependently to that of any other gene. 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