Exam tommorrow.....pls reply quickly....!

Asked by Sneha George | 28th Mar, 2011, 05:38: PM

Expert Answer:

Dear Student,

 a) Heredity- Heredity is the passing of traits to offspring (from its parent or ancestors).

b) Variation- the process, or accident of varying in condition, character, or degree.
c) Evolution- Evolution is the change over time in one or more inherited traits found in populations of organisms.
d) Genetics- is the science of genes, heredity, and variation in living organisms
e) Genes- A gene is a unit of heredity in a living organism
f) Traits:-
            1)Acquired Traits- traits that are acquired during the lifetime.
            2)Inherited Traits- traits that are inherited from parents or ancestors.
            3)Dominant Traits- traits that are expressed.
            4)Recessive Traits- traits that are suppressed due to the presence of dominant traits.
g)DNA- the basic genetic material in the body.
h)Sex Determination- the technique of differentiating between the two genders
i)Natural Selection- when nature is responsible for selecting certain traits or characters.
j)Genetic Drift- the change in the frequency of a gene variant (allele) in a population due to random sampling
k)Artificial Selection- when man is responsible for selecting certain traits or characters
l)Geographical Isolation- the separation of two (or more) groups of organisms by a geographical feature
m)Speciation- the evolutionary process by which new biological species arise
n)Classification- a method of grouping or organising information
o)
  1)Homologous Organs- they are structurally similar but different in function
  2)Analogous Organs- they serve the same function but are structurally different.
p)Fossils- preserved remains or traces of plants, animals etc.
q)Micro-Evolution-a change in gene frequency within a population over time
r)Human Evolution- is the origin and evolution of Homo sapiens as a distinct species from other hominids, great apes and mammals.


We hope that clarifies your query.
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Answered by  | 29th Mar, 2011, 12:20: AM

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