Heredity MCQ Quiz

30 questions

1. The 'Father of Genetics' is

   1. Darwin
   2. Mendel
   3. Lamarck
   4. Watson

2. Mendel performed experiments on

   1. maize
   2. garden pea
   3. rose
   4. wheat

3. A trait that expresses even in one copy is

   1. recessive
   2. dominant
   3. hybrid
   4. mutant

4. In a monohybrid cross Tt × Tt, the F2 phenotypic ratio is

   1. 1:1
   2. 3:1
   3. 9:3:3:1
   4. 0.04306712963

5. The genotypic ratio in a monohybrid F2 (Tt × Tt) is

   1. 3:1
   2. 0.04306712963
   3. 9:3:3:1
   4. 2:1

6. In a dihybrid cross, F2 phenotypic ratio is

   1. 3:1
   2. 0.04306712963
   3. 9:3:3:1
   4. 1:1

7. Alternative forms of a gene are called

   1. traits
   2. alleles
   3. chromosomes
   4. genotypes

8. The observable characteristic of an organism is its

   1. genotype
   2. phenotype
   3. allele
   4. gene

9. The genetic makeup of an organism is its

   1. phenotype
   2. genotype
   3. trait
   4. gene pool

10. Mendel's law that alleles separate during gamete formation is the law of

    1. dominance
    2. segregation
    3. independent assortment
    4. linkage

11. Human beings have how many pairs of chromosomes?

    1. 21
    2. 22
    3. 23
    4. 24

12. The sex chromosomes in a human female are

    1. XY
    2. XX
    3. XO
    4. YY

13. The sex chromosomes in a human male are

    1. XX
    2. XY
    3. YY
    4. XO

14. The sex of a child is determined by the

    1. mother
    2. father
    3. both equally
    4. doctor

15. A child inherits which chromosome from the father to be male?

    1. X
    2. Y
    3. both X
    4. none

16. The site of genes on a cell is the

    1. ribosome
    2. chromosome
    3. mitochondrion
    4. vacuole

17. Traits inherited from parents are carried by

    1. RNA only
    2. DNA (genes)
    3. proteins
    4. lipids

18. A pure tall pea plant has genotype

    1. Tt
    2. TT
    3. tt
    4. T

19. Crossing TT × tt gives F1 that is

    1. all dwarf
    2. all tall
    3. 3 tall:1 dwarf
    4. 1:1

20. Which is a homozygous genotype?

    1. Tt
    2. TT
    3. Rr
    4. Yy

21. Assertion: The father determines the sex of a child. Reason: The mother produces only X-bearing eggs.

    1. Both true, R explains A
    2. Both true, R not explanation
    3. A true, R false
    4. A false, R true

22. Two contrasting traits Mendel studied in pea seeds were

    1. tall/dwarf
    2. round/wrinkled
    3. white/violet
    4. axial/terminal

23. In F1 of a monohybrid cross, the recessive trait is

    1. expressed
    2. not expressed
    3. dominant
    4. lost forever

24. A cross considering one pair of traits is a

    1. dihybrid cross
    2. monohybrid cross
    3. test cross
    4. back cross

25. The percentage of tall plants in monohybrid F2 (Tt × Tt) is

    1. 0.25
    2. 0.5
    3. 0.75
    4. 1

26. Genes controlling a trait are found in pairs because

    1. cells are big
    2. chromosomes occur in pairs
    3. of mutation
    4. of variation

27. A test cross is done with a

    1. pure dominant
    2. pure recessive (tt)
    3. hybrid only
    4. new species

28. Rules of inheritance are determined by both

    1. only mother
    2. only father
    3. mother and father
    4. environment

29. Which of these represents a recessive dwarf pea plant?

    1. TT
    2. Tt
    3. tt
    4. T

30. Variation in a population is important because it

    1. causes death
    2. helps survival in changing environments
    3. stops reproduction
    4. reduces species

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