NEET INTRODUCTORY TEST SERIES 5 BIOLOGY

1. In Drosophila, sex determination mechanism is

(a) XX-XO
(b) ZZ-ZW
(c) XX-XY
(d) XY-XO

2. Sex chromosomes of birds are

(a) ZW-ZZ         
(b) ZZ-WW
(c) XX-XY      
(d) XO-XX.

3. Haplo-diploid sex determination is observed in

(a) grasshopper   
(b) hen
(c) Drosophila
(d) honey bee.

4. Given pedigree shows inheritance of autosomal recessive gene. What is the genotype of given parents?

(a) AA, aa
(b) aa, AA
(c) aa, Aa
(d) Aa, Aa

5. Process that leads to variation in DNA is/are

(a) recombination
(b) linkage
(c) mutation
(d) both (a) and (c).

6. A person with karyotype of XXY is affected by

(a) Klinefelter’s syndrome
(b) Down’s syndrome
(c) Turner’s syndrome
(d) Thalassemia.

7. _________is a point mutation.

(a) Sickle cell anaemia
(b) Haemophilia
(c) Colour blindness
(d) Down’s syndrome

8. Sex determination in grasshoppers, humans and Drosophila is similar because

a) females are heterozygous
b) males have one X-chromosome and females have two X-chromosomes
c) all males always have one Y-chromosome in all three species
d) the ratio of autosomes to sex chromosomes is the same in all three organisms.

9. Sex chromosomes of female is heteromorphic and male is homomorphic in

(a) human beings
(b) birds
(c) honey bees
(d) all of these.

10. Which is incorrect about colour blindness?

a) This is due to defect in either red or green cone of eye resulting in failure to discriminate between red and green colour.
b) A daughter will not normally be colour blind, unless her mother is a carrier and her father is colour blind.
c) If female has X^CX, then it is called carrier but when male has X^CY then it will be colour blind.
d) Out of total population of son of carrier woman, 25% have chances of being colour blind.

11. For a haemophilic boy, the chromosome number will be

(a) 46
(b) 45
(c) 44
(d) 42.

12. Thalassemia and phenylketonuria are disorders due to

(a) recessive autosomal genes
(b) dominant autosomal genes
(c) dominant sex genes
(d) recessive sex genes.

13. Study the pedigree chart of a certain family given below and select the correct conclusion which can be drawn for the character.

(a) The female parent is heterozygous.
(b) The parents could not have had a normal daughter for this character.
(c) The trait under study could not be colour blind.
(d) The male parent is homozygous dominant

14. Assertion: XX-XY type of sex determination mechanism is an example of female heterogamety and is found in
       Reason: Male heterogamy is seen in moths where males produce two different types of gametes.

a) Both assertion and reason are true and reason is the correct explanation of assertion.
b) Both assertion and reason are true but reason is not the correct explanation of assertion.
c) Assertion is true but reason is false.
d) Both assertion and reason are false.

15. Among the given groups of characters, identify the group with recessive characters only?

(a) Dwarf, white flower at terminal position
(b) Dwarf, white flower at axial position
(c) Dwarf, violet colour of flower
(d) Round and yellow seeds, terminal flowers

16. A plant heterozygous dominant for round seeds was crossed with a plant of wrinkled seeds. Which of the progenies agree with the expected result?

(a) 180 round and 300 wrinkled
(b) 305 round and 301 wrinkled
(c) 301 round and 1000 wrinkled
(d) 400 round and 300 wrinkled

17. How many types of gametes are found in F₁ progeny of cross between AABBCC and aabbcc?

(a) 3 
(b) 8
(c) 27
(d) 64

18. Genotype is

(a) genetic composition of many organisms
(b) genetic composition of plastids
(c) genetic composition of germ cells
(d) genetic composition of an individual.

19. In classic experiments on pea plants, Mendel did not use

(a) pod length
(b) seed shape
(c) flower position
(d) seed colour.

20. A pure tall plant can be differentiated from a hybrid tall plant

(a) by measuring length of plant
(b) by spraying gibberellins
(c) if all plants are tall after self-pollination
(d) if all plants are dwarf after self-pollination