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Biology Worksheet

This document is a biology worksheet for Class XII students, focusing on the topic of evolution. It includes questions on genetic concepts such as thalassemia, natural selection, genetic drift, cell structures, Australopithecines, Neanderthals, and Hardy-Weinberg equilibrium. Students are required to provide calculations, explanations, and descriptions related to these evolutionary topics.

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15 views1 page

Biology Worksheet

This document is a biology worksheet for Class XII students, focusing on the topic of evolution. It includes questions on genetic concepts such as thalassemia, natural selection, genetic drift, cell structures, Australopithecines, Neanderthals, and Hardy-Weinberg equilibrium. Students are required to provide calculations, explanations, and descriptions related to these evolutionary topics.

Uploaded by

1358jacktheripper
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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SHREE NIKETAN PATASALA – MANNIVAKKAM

CLASS : XII DATE : 20.07.2025


SUBJECT : BIOLOGY MARKS :30
CHAPTER 6 -EVOLUTION WORKSHEET
ANSWER THE FOLLOEING QUESTIONS:
1. Thalassemia is a disease caused by a specific gene mutation and it affects individuals who inherit two copies
of the mutant allele. In a population, the frequency of homozygous recessive individuals is 1 in 100. Calculate
the frequencies of the following - (a) recessive allele (a) (b) dominant allele (A)
2. 'Fitness is a result while natural selection is a process.' Explain the above statement.
3. Genetic drift will lead to speciation in very large populations. Explain why this statement is false in TWO
points
4. Prokaryotic and eukaryotic cells have distinct flagella with differences in structure and mechanism.
Prokaryotic flagella are helical and driven by a rotary motor powered by ion flow. Eukaryotic flagella feature
a 9+2 microtubule arrangement, propelled by microtubule sliding via dynein motor proteins. Identify if the
above can be classified as homologous or analogous structures. Justify your answer.
5. What is the frequency of heterozygous genotype (Aa) in a randomly mating population in which the frequency
of all dominant phenotypes is 0.54
6. When and where did Australopithecines live?Mention their characteristics. 2 A Australopithecines probably
lived in East African grasslands
7. Darwin observed an amazing diversity of finches at Galapagos Islands. Mention the varieties of Finches.
Define the phenomenon related to finches.

8.(a)When and where did Neanderthal man live?

(b)What was his brain capacity?

(c )mention the advantages he showed over Homo sapiens. 3 A

(d) They lived near east and central Asia between 1,00,000-40,000 years back.

(e ) brain size of 1400cc

(f ) They used hides to protect their body and buried their dead.

(g) Their brain size of 1400cc whereas Homo erectus had brain around 900cc

(h) Write the sequential order of Evolution of man ?

9. comment on the picture given below

10. What is the disturbance in Hardy-Weinberg genetic equilibrium indicative of ? Explain how is it caused ?

Explain any three

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