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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
1. evolution
2. heredity
3. generation
4. inheritance
if a normal cell of human body contains 46 pairs of chromosomes then the number of chromosomes in a sex cell of a human being is most likely to be
1. 60
2. 23
3. 22
4. 40
in the human blood grouping , the four basic blood types are type A , type B , type AB , ant type O . they are
1. simple dominant and recessive traits
2. co -dominant traits
3. recessive traits
4. inhertited traits
a preganat women has an equal chance of her baby being blood grooup A or blood group AB . which one of the following shows the possible genotype of the women and the father of the child?
1. |a|a and |b|o
2. |a|b nd |b|o
3. |a|o and |b|o
4. |o|b and |a|o
what will be the number of chromosomes present in each gamete produced by the plants if the palisade cells of a species of plant contain 28 chromosomes in all
1. 56
2. 28
3. 14
4. 4
the following results were obtained by a scientist who crossed the F1 generation of pre breeding parent for round and wrinkled seels

dominants trait recessive trait no of F2 offspring
round seeds wrinkled seeds 7524

from these result , it can be concluded that the actual number of round seed he obtained was
1. 1881
2. 22572
3. 2508
4. 5643
the cross between a tall tree (TT) and a short plant (tt) resulted in progeny that were all tall plants are
1. tallness is the dominant trait
2. shortness is the dominant trait
3. tallness is the recessve trait
4. height of plant is not governed by gene t or t
in peas a pure tall plant (TT) is crossed with a pure short plant . the ratio of pure tall plant to pure short plant in F2 generation will be
1. 1:3
2. 3:1
3. 1:1
4. 2:1
in humans all the chromosomes are paired perfectly exept one . these unpaired chromosomes are
a. large chromosomes
b. small chromosomes
c. Y chromosomes
d. X chromosomes
1. i and ii
2. iii and ii
3. iii and iv
4. ii and iv
which of the following determines the sex of a child
1. the length of the mother pregnancy
2. the length of the time between ovulation and copulation
3. the presence of an X chromosomes in an ovum
4. the presence of a Y chromosomes ina sperm
which is the one characteristic of the parent that can be inherited by their children
1. deep scar on chin
2. snub nose
3. technique of swimming
4. cut nose
process of selecting individual with desired character by man is called
1. hybridization
2. reproduction
3. artificial selection
4. natural selection
the theory of evolution of species by natural selection was given by
1. mendel
2. darwin
3. lamarck
4. weismann
the number of pair of sex chromosomes in the zygote of a human being is
1. 2
2. 3
3. 1
4. 4
A zygote which has an X chromosome inherited from the father will develop into a
1. girl
2. boy
3. either boy or girl
4. x chromosome does not influence the sex of a child
difference between organisms ina species are described as variation . which of the following would you describe as continous variation?
1. hair colour
2. eye colour
3. weight
4. sex
the more characteristics two species have in common
1. more closely they are related and more recently they had a common ancestors
2. more distantly they are related and more recently they had a common ancestors
3. more closely they are related and more distantly they had a common ancestors
4. more distantly they are related and more distantly they had a common ancestors
which concept was not included in charles darwin theory of natural selection
1. struggle for existance
2. punctuated equilibrium
3. survival of the fittest
4. overproduction of offspring
wild cabbage has evolved into new varities like cabbage , broccoli and cauliflower by
1. genetic drift
2. natural selection
3. reproductive isolation
4. artificial selection
the fossil remains of archaeopteryx is a connecting link between
1. reptiles and mammals
2. reptiles and bird
3. fish and amphibiam
4. amphibian and reptile
which of the following characters can be acquired but not inherited
1. colour of skin
2. size of body
3. colour of eyes
4. texture of hair
those organs which have the same basic structure but different functions are called
1. vestigial organs
2. analogous organs
3. homologous organs
4. none of these
those organs which have different basic structure but have similar appearance and perform similar function are called
1. analogous organs
2. homologous organs
3. vestigial organs
4. none f these
the human species has genetic roots in
1. australia
2. africa
3. america
4. indonesia
if a round , green seeded pea plat (RRyy) is crossed with a wrinkled yellow seeded pea plant (rrYY) , the seeds produced in F1 generation are
1. round and green
2. round and yellow
3. wrinkled and green
4. wrinkled and yellow
what does the progeny of a tall plant with round seeds and a short plnt with wrinkled seeds look like
1. all are tall with round seeds
2. all are short with round seeds
3. all are tall with wrinkled seeds
4. all are short with wrinkled seeds
a man with blood group A marries a woman having blood group O . what will be the blood group of the child
1. O only
2. A only
3. AB
4. equal chance of aquiring blood group A or blood group O
which of the following pairs are homologous organs
1. forelimbs of a bird and wings of a bat
2. wings of a bird and wings of a butterfly
3. pectoral fins of a fish and forelimbs of a horse
4. wings of a bat and wings of a cocokroach
the number of pair of sex chromosomes in the zygote of a human being is
1. 2
2. 3
3. 1
4. 4
A zygote which has an X- chromosomes inherited from the father will develop into a
1. girl
2. boy
3. either boy or girl
4. X chromosomes does not influence the sex of a child

dominants trait	recessive trait	no of F2 offspring
round seeds	wrinkled seeds	7524

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