Class 10 heredity and Evolution-biology Welcome to your Class 10 heredity and Evolution-biology 1. The only progressive trend in evolution seems to be that more and more ____________ body designs have emerged overtime. Both A and B None of the above Complex Simple None 2. Which of the following is true about chromosomes? Each cell will have two copies of each chromosome, one each from the male and female parents. Separate independent pieces responsible for variations is called a chromosome. Two germ cells combine to restore the normal number of chromosomes in the progeny. All of the above. None 3. Among the following which is not one of the direct conclusion that can be drawn from Mendel's experiment? For recessive trait to be expressed, both copies should be identical. Two copies of each trait is inherited in sexually reproducing orgainsm Only one parental trait is expressed in F 1 generation. Natural selection can alter frequency of an inherited trait. None 4. 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 5. The two versions of a trait (character) which are brought in by the male and female gametes are situated on Any chromosome Two different chromosomes Sex chromosomes Copies of the same chromosome None 6. Due to Starvation if beetles have low body weight then this character is transfer to the next generation or not it is based on 7. 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 Inheritance Variation Evolution None of the above None 8. Inheritance from the previous generation provides None of the above Only a common basic body design Only subtle changes in it in the common body design Both A and B None 9. Mendel's experiments on dihybrid cross was based on Yellow cotyledon, round seed x green cotyledon, wrinkled seed 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 None 10. How are variations created? Both A and B Because DNA copying mechanism is not accurate Because transcription of mrna from DNA is not accurate Because DNA copying mechanism is 100% accurate None 11. Mendel's experiments on dihybrid cross was based on Yellow cotyledon, round seed x green cotyledon, wrinkled seed Tall plant, red flower x dwarf plant, white flower Green cotyledon, round seed x yellow cotyledon, wrinkled seed Tall plant yellow flower x dwarf plant, white flower None 12. 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 III & IV II, III and IV I, III and IV II & IV None 13. 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: 0 9 3 1 None 14. 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? Carl Sagan Murray Gell-Mann Donald Arthur Glaser Stanley Lloyd Miller None 15. inhabit the most in hospitable habitats like hot springs, deep-sea thermal vents and the ice in Antarctica. 16. The characteristics of the second generation organisms produced asexually will be Comparatively similar Some will be unique while others will be similar due to inheritance Completely similar All of the above None 17. 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 B, C and D C, D and E None 18. 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 19. Mendel's Law of independent assortment stated that: Recessive alleles will be masked by dominant alleles. The segregation of alleles for one gene occurs independently to that of any other gene. 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. None 20. The phenomenon where individuals of a species exhibit differences in characteristics are called: Evolution Adaptation Variation All of the above None 21. What are the main theories about how humans got to the America? Humans were always in the America. Humans went by planes. Humans walked across the continent of Pangea. None of the above None Time's up Please Share This Share this content Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Leave a Reply Cancel replyCommentEnter your name or username to commentEnter your email address to commentEnter your website URL (optional) Save my name, email, and website in this browser for the next time I comment.
