Mapping our Genes

Ch. No. 13. Mapping our Genes
Q1. Fill in the blanks
1.     In ___________ mode of reproduction the offsprings are with minor differences. (asexual)
2.     Both the parents contribute equal amount of ___________ material to the offspring. (genetic)
3.     Dominant character masks the ___________ characters. (recessive)
4.     Selection by nature is not ____________ but ____________. (deliberate, natural)

Q2. Give scientific reasons:
1.     In sexual mode of reproduction greater diversities are generated.
Ans.
i.                 In sexual mode of reproduction two parents are involved.
ii.               Each one has its own DNA copies that are passed on through their nuclei at the time of fertilization of gametes.
iii.              Therefore more diversity is produced.
iv.              Moreover, the process of meiosis at the time of gamete formation, also produces variations. Hence in sexual mode of reproduction greater  
2.     Phenotypic and genotypic ratios are different.
Ans.
i.                 Phenotype is the appearance or any detectable characteristic feature of an individual life red and white flowers.
ii.               Genotype is the genetical composition of individuals like RR, Rr and rr.
iii.              Hence, phenotypic and genotypic ratios are different.  

3.     In human beings the gametes from the male parent decides the sex of the baby.
Ans.
i.                 In human male gametes, two dissimilar chromosomes XY are present whereas in females two similar chromosomes XX are present.
ii.               All children inherit ‘X’ chromosomes from their mother and ‘X’ or ‘Y’ from their father.
iii.              Hence the gametes from the male parent decide the sex of the baby.

4.     Paleontological evidence suggests that invertebrates came into existence before the vertebrates.
Ans.
i.                 A systematic study of fossils and its occurrence revealed that the deepest layers of land were found to have fossils of invertebrates.
ii.               In layers above them were found vertebrates such as fish – like animals, amphibians, reptiles, birds and mammals.
iii.              This suggests that invertebrates came into existence before the vertebrates.

Q3. With the help of a diagram (Punnett square) show a Mendelian experiment where tall pea plant bearing red flowers is crossed with a short pea plant bearing white flowers. Write both the phenotypic and genotypic ration for F2 generation.


Q4. Write a short note on:
Darwin’s theory of evolution.
i.                 Darwin’s theory of evolution is based on natural selection.
ii.               Darwin’s theory of natural selection suggests that only the fittest survive.
iii.              All those plants and animals which are not fit die.
iv.              These fit species reproduce and pass on the relevant characteristics to the following generation which in turn would make them fit for survival.
v.                This process of selection of characteristics that contribute to the fitness for survival was called natural selection by Darwin.
vi.              The criterion for the natural selection is the only one i.e. successful adaptation for growth and reproduction in the given environment. 

No comments:

PDF FILE TO YOUR EMAIL IMMEDIATELY PURCHASE NOTES & PAPER SOLUTION. @ Rs. 50/- each (GST extra)

HINDI ENTIRE PAPER SOLUTION

MARATHI PAPER SOLUTION

SSC MATHS I PAPER SOLUTION

SSC MATHS II PAPER SOLUTION

SSC SCIENCE I PAPER SOLUTION

SSC SCIENCE II PAPER SOLUTION

SSC ENGLISH PAPER SOLUTION

SSC & HSC ENGLISH WRITING SKILL

HSC ACCOUNTS NOTES

HSC OCM NOTES

HSC ECONOMICS NOTES

HSC SECRETARIAL PRACTICE NOTES

2019 Board Paper Solution

HSC ENGLISH SET A 2019 21st February, 2019

HSC ENGLISH SET B 2019 21st February, 2019

HSC ENGLISH SET C 2019 21st February, 2019

HSC ENGLISH SET D 2019 21st February, 2019

SECRETARIAL PRACTICE (S.P) 2019 25th February, 2019

HSC XII PHYSICS 2019 25th February, 2019

CHEMISTRY XII HSC SOLUTION 27th, February, 2019

OCM PAPER SOLUTION 2019 27th, February, 2019

HSC MATHS PAPER SOLUTION COMMERCE, 2nd March, 2019

HSC MATHS PAPER SOLUTION SCIENCE 2nd, March, 2019

SSC ENGLISH STD 10 5TH MARCH, 2019.

HSC XII ACCOUNTS 2019 6th March, 2019

HSC XII BIOLOGY 2019 6TH March, 2019

HSC XII ECONOMICS 9Th March 2019

SSC Maths I March 2019 Solution 10th Standard11th, March, 2019

SSC MATHS II MARCH 2019 SOLUTION 10TH STD.13th March, 2019

SSC SCIENCE I MARCH 2019 SOLUTION 10TH STD. 15th March, 2019.

SSC SCIENCE II MARCH 2019 SOLUTION 10TH STD. 18th March, 2019.

SSC SOCIAL SCIENCE I MARCH 2019 SOLUTION20th March, 2019

SSC SOCIAL SCIENCE II MARCH 2019 SOLUTION, 22nd March, 2019

XII CBSE - BOARD - MARCH - 2019 ENGLISH - QP + SOLUTIONS, 2nd March, 2019


BUY FROM PLAY STORE

DOWNLOAD OUR APP


HOW TO PURCHASE OUR NOTES?



S.P. Important Questions For Board Exam 2020


O.C.M. Important Questions for Board Exam. 2020


Economics Important Questions for Board Exam 2020


Chemistry Important Question Bank for board exam 2020


Physics – Section I- Important Question Bank for Maharashtra Board HSC Examination


Physics – Section II – Science- Important Question Bank for Maharashtra Board HSC 2020 Examination


MUST REMEMBER THINGS on the day of Exam


Are you prepared? for English Grammar in Board Exam.


Paper Presentation In Board Exam


How to Score Good Marks in SSC Board Exams


Tips To Score More Than 90% Marks In 12th Board Exam


How to write English exams?


How to prepare for board exam when less time is left


How to memorise what you learn for board exam


No. 1 Simple Hack, you can try out, in preparing for Board Exam

How to Study for CBSE Class 10 Board Exams Subject Wise Tips?

JEE Main 2020 Registration Process – Exam Pattern & Important Dates

NEET UG 2020 Registration Process Exam Pattern & Important Dates

How can One Prepare for two Competitive Exams at the same time?

8 Proven Tips to Handle Anxiety before Exams!