People who carry an allele for normal haemoglobin and an allele for sickle cell are resistant to malaria. They are examples of:

1. heteozygote advantage

2. extreme diploidy

3. outbreeding

4. recessive superiority

Subtopic:  Types of Natural Selection |
 72%
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The unit of evolution is now known to be the:
1. individual
2. family
3. population
4. species

Subtopic:   A BRIEF ACCOUNT OF EVOLUTION |
 56%
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The struggle for existence is a consequence of:

(1) Each organism leaving more organisms than needed to replace itself

(2) Innate competitive tendencies

(3) The inevitable difficulty of coping with climatic conditions

(4) Territories and dominance hierarchies

Subtopic:  Darwin's Theory |
 52%
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Darwin believed that a giraffe has a long neck because:

1. a creator designed it that way

2. catastrophes eliminated short neck forms

3. its ancestors stretched their necks to get food

4. ancestral giraffes with longer necks got more food and left more surviving off-springs.

Subtopic:  Summary of Darwin's Theory |
 64%
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In a population of red (dominant) and white flowers, the flowers of red flowers is 91%. What is the frequency of the red allele?

1. 9%

2. 30%

3. 91%

4. 70%

Subtopic:  Population Genetics |
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In a sympatric speciation, there is:

1. geographical isolation between groups of population
2. no geographical isolation between groups of population
3. reproductive isolation of a subpopulation in the midst of the parent population 
4. geographical isolation bout no reproductive isolation
Subtopic:  Concept of Speciation |
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In modern terms, selection refers to :

1. Inheritance of dominant characters
2. differential reproduction 
3. a decrease in allele frequency in a population
4. differences in the contribution of various genotypes to the next generation 

Subtopic:  Summary of Darwin's Theory |
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In genetic drift, the term "genetic bottleneck" means:

1. reduction in allele frequencies or richness

2. random change in allele frequency by chance alone

3. sudden increase in the number of individuals

4. reproductive isolation of the population

Subtopic:  Sources of Variation: 2 | Sources of Variation |
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What is genetic equilibrium?

(1) When all the alleles of a gene are present in a population in equal frequencies

(2) When the number of heterozygotes in a population are equal to the number of either of the homozygote

(3) When the number of heterozygotes in a population are equal to the number of either of the homozygote

(4) When the frequency of particular genes or alleles remain constant in a population through generations

Subtopic:  Population Genetics |
 76%
From NCERT
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Which of the following is not a precondition for Hardy-Weinberg Equilibrium?

1. The population should be large

2. The mating should be assortative

3. There is no gene flow into or out of the population

4. All offspring should be equally fertile.

 

Subtopic:  Hardy Weinberg Law: 1 | Hardy Weinberg Law |
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