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Que
What is heredity
Ans
The transmission of genetically based characteristics from parents to the offspring is called heredity
Que
What are variations
Ans
Small differences among the individuals of the same species are called variations
Que
Who discovered the basic principles of genetics
Ans
Gregar John Mendel end of 19th century discovered the basic principle of genetics
Que
Which plant selected by Mendel for his experiments
Ans
Mental selected the garden pea ( pisum Sativum) for his experiments
Que
Why Mendel selected pea plant for his experiments
Ans
Mendel selected pea plant for his experiments because of following reasons
1) there are many varieties where available in alternative forms of character
2) varieties where available and pure forms that produce the same type of generation after generation
3) pea plant are self pollinated and could be as well as cross pollinated artificially
Que
What are the three mendel's law of inheritance
Ans
Mendel summarised his result known as mendel's law of inheritance
1) Law of Dominance
How does a pair of contrasting characters present together only one is able to express itself while the other remains suppressed
The character which expresses is called dominant character and the one which has unexpressed is called recessive character
2) Law of Segregation
The two members of a pair of factors separate during the formation of gametes
3) Law of independent assortment
There are two pairs of characters the distribution of the alleles of one character into the gametes is independent of the distribution of the alleles of other character
What is sex chromosome
Ans
These are kind of chromosomes that determine the sex of an organism every human has only one pair of sex chromosome
Que
Describe the conditions when the child born is a son or a daughter
Ans
The sex of the child depends upon the kind of sperm that fertilizes the egg
Daya contains only X chromosomes but the response contains both X and y chromosomes
a) if the egg(X) is fused by X bearing sperm the resulting combination is XX the female constitution and the child born is a daughter
b) if the egg(X) is fused by Y bearing sperm the resulting combination is XY the male constitution and the child born is a Son
Or
The male cell carries one X and Y chromosome where as female cell carries two XX chromosomes
The fusion of X chromosome bearing sperm of male cell with the X chromosome of female cell produces a female child
While the fusion of Y chromosome bearing sperm of male cell with X chromosome of female egg produces a male child
Therefore it is the contribution of father (sperm of male gamete) is determines the sex of newborn baby
Ans.
The phenotypic monohybrid ratio is 3:1
Que
What is the phenotypic dihybrid ratio in F2 generation
Ans
The dihybrid ratio in F2 generation. 9:3:3:1
Fri Nov 18, 2022