Unit 3 Chapter 1 (1st Secondary) Biology

47 Questions | Total Attempts: 368

SettingsSettingsSettings
Unit 3 Chapter 1 (1st Secondary) Biology - Quiz


Questions and Answers
  • 1. 
    Chromosomes are arranged descendingly in a karyotype according to 
    • A. 

      The number of genes that they carry

    • B. 

      The type of genes that they carry

    • C. 

      Their size 

    • D. 

      Their density

  • 2. 
    Karyotype of a male human differs from that of the female in the
    • A. 

      Number of sex chromosomes

    • B. 

      Type of sex chromosomes  

    • C. 

      Arrangement of autosomes

    • D. 

      Number of the autosome pairs

  • 3. 
    The figure represents the karyotype of a(an) -----------
    • A. 

      Human male

    • B. 

      Human female

    • C. 

      Sperm

    • D. 

      Ovum

  • 4. 
    If the number of chromosomes in a human skin cells is 23 pairs, so the number of chromosomes in the sperm is
    • A. 

      23 pairs

    • B. 

      23

    • C. 

      46 pairs

    • D. 

      46

  • 5. 
    The greatest number of chromosomes is found in the -------- cells
    • A. 

      Human

    • B. 

      Dog

    • C. 

      Cat

    • D. 

      Frog

  • 6. 
    The least number of chromosomes is found in the ------ cells
    • A. 

      Wheat

    • B. 

      Onion

    • C. 

      Sweet potato

    • D. 

      Pea

  • 7. 
    From the characters of the human sex chromosomes
    • A. 

      They are the pair number 7

    • B. 

      They are the pair number 23

    • C. 

      They do not carry genes

    • D. 

      They are autosomes

  • 8. 
    The gene is formed of a sequence of
    • A. 

      DNA

    • B. 

      Nucleotides

    • C. 

      Amino acids

    • D. 

      Chromosomes

  • 9. 
    The two scientists that had reached to the principles of the chromosomal theory are
    • A. 

      Urey and Miller

    • B. 

      Watson and Crick

    • C. 

      Mendel and Morgan

    • D. 

      Sutton and Boveri

  • 10. 
    The ratio of segregation in the 2nd generation in the complete dominance according to Mendel's 1st law is
    • A. 

      3:0

    • B. 

      1:1

    • C. 

      3: 1

    • D. 

      1:2:1

  • 11. 
    The ratio of the 2nd generation in the law of independent assortment is
    • A. 

      3:1

    • B. 

      1:1

    • C. 

      2:1

    • D. 

      9:3:3:1

  • 12. 
    A crossing took place between a plant (BB) and another one (bb) , the  result was the production of 150 new plants. so the number of plants which carries the genotype (Bb) was
    • A. 

      30

    • B. 

      150

    • C. 

      75

    • D. 

      50

  • 13. 
    A male cat of a genotype (Aa) is crossed to a female one having the same genotype, so the possibility of producing cats with a genotupe (AA) is
    • A. 

      25%

    • B. 

      50%

    • C. 

      75%

    • D. 

      100%

  • 14. 
    If the genotype of a child is (bb) so the genotype of his parents should be
    • A. 

      Bb x Bb

    • B. 

      BB x bb

    • C. 

      BB xBb

    • D. 

      BB x BB

  • 15. 
     The percentage of gametes with a genotype (Ab) produced from  Aabb is
    • A. 

      50%

    • B. 

      75%

    • C. 

      25%

    • D. 

      100%

  • 16. 
    If the percentage of the offspring with a genotype AABB is 25% so the parents are 
    • A. 

      AABB x aabb

    • B. 

      AABB x AaBb

    • C. 

      Aabb x aabb

    • D. 

      AaBB x AABB

  • 17. 
    If two Pea plants carry purple flowers (Rr) were crossed, so the percentage of appearance of white flowers in the resulted generation is
    • A. 

      25%

    • B. 

      Zero %

    • C. 

      75%

    • D. 

      100%

  • 18. 
    When a pure purple flowered Pea plant was crossed with another one of white flowers, so the resulted generation will be
    • A. 

      100% purple

    • B. 

      75% purple : 25% white

    • C. 

      50% purple : 50% white

    • D. 

      100% white

  • 19. 
    The genotype GgRR can produce the following gametes
    • A. 

      Gg and Rr

    • B. 

      GG and Rr

    • C. 

      Gr and gR

    • D. 

      GR and gR

  • 20. 
    A pure character is the character which has 
    • A. 

      Two different genes

    • B. 

      Two genes on two different pairs of chromosomes

    • C. 

      Two similar genes

    • D. 

      Different alleles

  • 21. 
    A gene is a section of _____ that contains the instructions for making a particular type of _______.
    • A. 

      DNA and protein

    • B. 

      Nucleus and cytoplasm

    • C. 

      DNA and chromosomes

    • D. 

      Chromosomes and protein

  • 22. 
    Which one of the following is an acquired characteristic?
    • A. 

      Being a super taster

    • B. 

      Hair colour

    • C. 

       Eye colour

    • D. 

      Being good at football

  • 23. 
    If you crossed two heterozygous plants, how many of the offspring will also be heterozygous?
    • A. 

      All

    • B. 

      Half

    • C. 

      3/4

    • D. 

      1/4

  • 24. 
    A dihybrid cross (AaBb x AaBb) will result in what offspring ratio? 
    • A. 

      9:3:3:1

    • B. 

      9:7

    • C. 

      3:1

    • D. 

      9:3:3:1 or  9:7

  • 25. 
    A plant that has purple flowers is crossed with one that has white flowers. The offspring were half white and half purple. What were the genotypes of the parents?
    • A. 

      Pp X pp

    • B. 

      Pp X Pp

    • C. 

      PP X pp

    • D. 

      PP X Pp

Back to Top Back to top