GENETICS Flashcards
Genetics derived from the word gene which means
To become and to grow into
What makes u unique, or one of a kind
Genetics
Why family members look alike
Genetics
Why some disease like diabetes or cancer run in families
Genetics
Proposed the theory that a moist vapor descends from the brain and nerves
Pythagoras
That each parent produce a semen which arises directly from various parts of the body
Empedocles
Though that the vitalizing effect considered as highly purified blood
Aristotle
According to him the mother furnishes innert matter, and the father gives the life giving power, “dynamic to the new life
Aristotle
He believed that the inheritance was conveyed via blood
Aristotle and the reason why people still refer to “blood relatives”“blood lines” and offspring as products of their “flesh and blood”
Preformation theory was proposed by two dutch biologist
Swammerdam and Bonet (1720-1793)
The preformation theory state that a miniature human was already perform in egg and sperm
Homunculus
This theory was rejected because this could not be proved scientifically
Preformation theory
THEORY OF EPIGENETICS was proposed by a German biologist and it states that egg or sperm cells do not contain miniature human but that the gametes contained undifferentiated living substance capable of forming the organized body after fertilization.
Wolff, This proposition was called as epigenetic concept
THEORY OF ACQUIRED CHARACTERS was proposed by, a French biologist.
Lamarck (1744-1829)
This theory states that a new character once acquired by an individual shall pass on to its progeny.
Lamarck (1744-1829)
This theory was disproved by Weismann. He cut the tail of mice for successive generations
THEORY OF ACQUIRED CHARACTERS
THEORY OF PANGENES was proposed by and an English naturalist.
Charles Darwin (1809 – 1882)
According to him, each part of the animal body produces a minute copy of its own, called
gemmule or pangene
theory of pangenesis is also known as the
“theory of blending inheritance”
He developed the theory of natural selection
Charles Darwin (1809 – 1882)
the idea that members of a population who are better adapted to their environment will be the ones most likely to survive and pass their traits on to the next generation.
theory of natural selection,
On the Origin of Species by Means of Natural Selection (1859)
Charles Darwin (1809 – 1882)
GERMPLASM THEORY this theory was advocated by and a German biologist.
August Weismann (1834-1914),
According to this GERMPLASM THEORY, organism’s body contains two types of cells namely
somatic cells and reproductive cells
form the body and its various organ systems
somatic cells
form sperm and ova
reproductive cells
The somatic cells contain the
“somatoplasm”
reproductive cells contain the
“germplasm”
___ which were caused by the environment, cannot influence the germplasm and hence acquired characters are not inherited
(somatoplasm),
Before Mendel’s experiment and ideas, Genetics was
poorly understood
conducted experiments on pea much before Mendel but failed to formulate the laws of inheritance because he could not use the mathematics to his results.
Knight (1779)
a German botanist performed hybridization experiments in tobacco and compared the hybrids with their parents. He demonstrated that the hybrids may resemble one or the other parent or may be intermediate between them. He also showed that both the parents make equal contributions to the hybrids.
J. Kolreuter (1733-1806),
done experiments similar to Kolreuter and they observed the similar results.
Gartner (1772-1850) and Naudin (1815-1899)
developed the understanding genetics by experimenting garden peas (Pisum sativum).
Gregor Mendel
Father of Modern Genetics
Gregor Mendel
Austrian biologist, meteorologist, and Augustinian Priest
Gregor Mendel
wherein he showed that “factors of inheritance” are transferred from parents to offspring.
Gregor Mendel
because they are easy to grow, easy to artificially hybridize (self-pollinating plants), has a short life cycle, with many offsprings in a single cross, and the presence of contrasting traits (alleles), and his use of pure breeds
(Pisum sativum)
responsible for observable characteristics
genotype
as result of fertilization
phenotype