offspring of hybrids are inviable or sterile
a hybrid zygote is formed but it fails to develop
hybrid adults fail to produce functional gametes
sperms and ova of different species of animals are unable to fuse
A. offspring of hybrids are inviable or sterile
moulds
coprolites
petrified
cast
Charles Darwin
Lamarck
Wsismann
Becker
Lamarckism
Theory of natural selection
Bird flight mechanisms
Both and
offspring of hybrids are inviable or sterile
a hybrid zygote is formed but it fails to develop
hybrid adults fail to produce functional gametes
sperms and ova of different species of animals are unable to fuse
occurrence of homologous and vestigeal organs
occurrence of analogous and vestigial organs
occurrence of homologous and analogous organs
occurrence of analogous oragans only
Fishes
Amphibians
Reptiles
Birds
Darwin
Herbert Spencer
Mai thus
Lovell
Centred Africa
China
India
Australia
homologous
analagous
ativistic
vestigeal
Oxygen
Hydrogen
Methane
Ammonia
Oriental region
Ethiopian region
Australian region
Palaearctic region
Bateson
Mendel
Wallace
Lamarck
variation
evolution
autotomy
mutation
origin of life
evolution
mutations
embryology
Lamarck
Morgan
Charles Darwin
Many biologists of 19th century
Homo sapiens
Pithecanthropus
Sinanthropus
None of these
Mesozoic era
Coenozoic era
Palaeozoic era
None of these
Peripatus
Archaeopteryx
Tachyglossus
Balanoglossus
Sinanthropus pekinensis
Homoerectus
Homo rhodesiensis
Homo spisaens
Pisces
Birds
Ruling mammals
Ruling reptiles
adaptive radiation
adaptive convergence
use and disuse of organs
none of these
miobibbus
eohippus
merychippus
pliohippus
2n = 44
2n = 46
2n = 48
none of these
Java man
Neanderthal man
Peking man
Cromagnon man
Paleozoic
Mesozoic
Cenozic
Proterzoic
protein folding
transcriptional control
nonsense mutation
none of these
batesian mimicry
mullerian mimicry
warning colouration
concealing colouration
Nose
Scales
Teeth
Hindlimbs
they show adaptive variations to their environment
they share the common karyotype
they can freely interbreed and share a common gene pool
their features are different yet they are similar essentially
Wisdom teeth
Fossa ovalis
Muscles of ear pinna
Ileum