Point to remember:-
1. Species maintain continuity by reproduction. 2. Variation in different degrees occur. 3. Variants have unequal chances of survival. 4. In sexually reproducing individuals, for the same trait genes have two copies. Unidentical copies bear dominant and recessive nature. 5. Traits separately inherited, yields new combinations of traits in progeny. 6. The sex of human progeny is determined by the sex chromosomes inherited from father. 7. Variation in combination with geographical isolation might lead to speciation. 8. Evolutionary relationship among living organisms become visible in hierarchy of classification. 9. Study of living forms as well as dead remains of organisms emerges as evolutionary scene. 10. DNA changes accumulated over a time span has resulted in evolution of complex organs like eye as exhibited by structure of eye in different animals. 11. Features like feathers have evolved as a function of change in allocated task. 12. Evolution is not progress from lower to higher forms. 1 mark questions :- 1. Which of the two exhibit greater variation : asexual or sexual reproduction? 2. Why all the variants don't have equal chances of surviving? 3. What is heredity? 4. At which place on earth did humans appeared first? 5. Give the name of plant studied by Mendel? 6. Name the acid which is information source for making proteins in cells. 7. What is the chemical nature of enzymes? 8. Define gene.9. Which one of the two is shorter in length 'X' or 'Y'? Chapter - 9 Heredity and Evolution read more............
53 Comments
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3/2/2012 07:33:29 am
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25/2/2012 04:47:59 am
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vishes
13/2/2014 04:48:43 am
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cat
25/1/2015 11:29:43 am
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prithi
26/1/2015 02:12:20 pm
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10/2/2012 10:22:24 am
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27/10/2012 12:40:29 pm
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28/2/2015 09:26:43 am
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11/2/2012 02:07:35 am
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7/3/2015 08:47:09 am
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ann
11/3/2012 12:03:39 pm
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j.sunil
15/6/2012 05:51:04 am
Practice question
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18/11/2012 12:41:53 pm
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raj
5/1/2013 01:31:16 am
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22/1/2013 10:47:59 pm
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priyanshu
22/1/2013 10:48:36 pm
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ayushi
3/2/2013 08:42:20 am
revision for test
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xx
3/2/2013 03:39:47 pm
very interesting
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Hot choco fudge
15/2/2013 02:52:35 pm
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25/2/2013 01:57:46 pm
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25/2/2013 01:59:51 pm
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akshit
12/3/2013 07:31:24 am
sir plz answer me a question that if the parents have light eyed colour n there child have a dark eye then its a dominant trait or recessive?? and why??
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Niks
8/11/2014 11:59:20 am
it's recessive because it is hidden character or traits.
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Himanshu
16/5/2013 10:00:36 am
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20/1/2014 09:34:51 am
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18/2/2014 05:45:48 am
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19/2/2014 05:42:31 am
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akshay
1/1/2015 07:22:35 am
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sachin
29/10/2015 04:32:02 pm
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Christina eva
25/1/2015 12:35:04 pm
it wasn't enough it is lacking many important terms
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cutiee
26/1/2015 12:31:48 pm
Excel
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8/2/2015 09:14:11 am
low grade notes. not good for smart students who luv science...
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Ayushman
2/3/2015 10:01:01 am
This is a dumb site bcoz thers a ques. which i found whose ans. given is completely wrong...............Its in Heredity and evolution ---) NCERT Sol'ns...If u guyz want check out the corrct ans.
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rahul
7/3/2015 09:02:14 am
For your kind information mr ayushman No, the information is not enough. Though it is already established that the allele for A is dominant over the allele for O, the info presented is not enough to support this. In this case, if both parents are homozygous, O allele is dominant. We can also assume, that the woman is heterozygous if O is dominant... or the man is heterozygous if A is dominant.
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Chocolatefanatic
28/12/2015 03:10:35 pm
Imagine the Tt x Tt monohybrid cross.
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Niki
22/3/2015 08:14:05 am
It's very helpful I like it
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Kumud
11/10/2015 11:32:37 am
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kumud
12/10/2015 08:48:37 am
Too Gud.....gues......not bad....it helps me a lot.....
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