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[HEREDITY AND EVOLUTION ]
CLASS :- 10TH
What is Gene ? Explain the two types of Gene in brief with example ?
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[HEREDITY AND EVOLUTION ]
CLASS :- 10TH
What is Gene ? Explain the two types of Gene in brief with example ?
❌❌NO SPAM. !!❌❌
NO UNWANTED ANSWERS ALSO......
@ MAYA KASHYAP ❤️❤️
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A UNIT OF HEREDITY WHICH IS TRANSFERRED FROM A PARENT TO OFFSPRING NA IS HELD TO DETERMINE SOME CHARACTERISTIC OF THE OFFSPRING.
IT IS OF SIX TYPES :-
# COMPLEMENTARY GENES
# DUPLICATE GENES
# POLYMERIC GENES
# MODIFYING GENES
# LETHAL GENES
# MOVEABLE GENES
TYPE 1 => COMPLEMENTARY GENES :-
BATESON and PUNNETT crossed two different white flowered varieties of sweet pea and obtained an F1 progeny of red flowered plants. On self-pollination the F1 plants gave F2 progeny of 9 red and 7 white flowered plants. Single crosses between desired floorboard variety and two different white flowered varieties showed that the gene for red colour was dominant over the gene for each of the two white varieties.
TYPE 2 => DUPLICATE GENES :-
When two or more genes have the same effect on a given trait, they are referred to as duplicate genes. In MS degine for Yellow endosperm is dominant over white and endosperm. A pure breeding yellow endosperm plant when crossed to a white endosperm plant yields yellow endosperm in F1.
TYPE 3 => POLYMERIC GENES :-
In Cucurbita Pepo (summer squash) fruit shape could be sperical or cylindrical. The spherical fruit shape is dominant over cylindrical and is controlled by two independent genes. Thus there are two different varieties of spherical fruit plants.
TYPE 4 => MODIFYING GENES :-
As more and more instances of gene interaction have discovered, the earlier notion that one gene controls one phenotype independently of other jeans had to be discarded. In reality and observed phenotype is the result of many Complex processes within an organism. It is reasonable than that men jeans should be involved in the final expression of a trait.
TYPE 5 => LETHAL GENES :-
IT OF (V) TYPES :-
(I) DOMINANT LETHALS
(II) RECESSIVE LETHALITY
(III) SEX - LINKED LETHALS
(IV) CONDITIONAL LETHALS
(V) EARLY AND LATE ACTING LETHALS
TYPE 6 => MOVEABLE GENS :-
There are genes or segments of DNA that can become incorporated and function at number of locations on the genome. The F factor can integrate at specific sites on the E. coli genome. Molecular studies have shown that the F element consists of three different functional blocks of genes.
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