What Are Alleles

Q. In a population that is in Hardy-Weinberg equilibrium, the frequency of the recessive homozygous genotype of a certain trait is 0.16. What is the percentage of individuals homozygous for the dominant allele?

1. 48%
2. 16%
3. 25%
4. 36%

Q.

The phenotypic ratio in the F₂ generation of a dihybrid cross is

1. 12:3:4

2. 9:3:3:1

3. 1:2:2:4:1:2:1:2:1

4. 7:1:1:7

Q.

What is the importance of Hardy Weinberg equation?

Q. Frequency of an autosomal lethal gene is 0.4. The frequency of carrier in a population of 200 individual is

1. 72
2. 96
3. 104
4. 36

Q.

1) Factors that will not produce any change in Hardy-Weinberg equilibrium a) directional selection b) stabilizing selection c)balanced polymorphism d)distributive selection\random mating

2) In an increased industrial polluted ares, dark coloured moth appear among the light one .It is an example of a)genetic drift b) mutations c) selection-direction based d) Random matings

Q. If the frequency of a dominant phenotype in a stable population is $75\%$, the frequency of recessive allele in that population would be

1. $37.5\%$
2. $75\%$
3. $9.4\%$
4. $50\%$

Q. Which of the following is true according to Hardy-Weinberg principle ?

1. Five factors are known to affect Hardy-Weinberg equilibrium -gene migration or gene flow, genetic drift, mutation, genetic recombination and natural selection.
2. Sum total of all the allelic frequencies is 1.
3. All of the above.
4. The allele frequencies in a population are stable and is constant from generation to generation.

Q. What is genetic equilibrium? Write any four factors affecting Hardy-Weinberg equilibrium.

Q.

What does gene frequency mean?

Q.

Change in frequency of alleles in a population results in evolution, is proposed in:

1. Hardy-Weinberg principle

2. Lamarck's theory

3. Darwin's theory

4. De Vries theory

Q. State Hardy-Weinberg principle of genetic equilibrium. Write any four factors affecting the equilibrium.

Q. With the help of an algebraic equation, how did Hardy-Weinberg explain that in a given population the frequency of occurrence of alleles of a gene is supposed to remain the same through generations? [2]

Q.

What is Neutral Polymorphism?

Q. In a particular population, if the frequency of the recessive allele is 0.6 then the frequency of dominant allele is

1. 0.48
2. 0.4
3. 0.36
4. 0.16
5. 0.6

Q. The tendency of population to remain in genetic equilibrium may be disturbed by _________.

1. Random mating
2. Lack of migration
3. Lack of mutations
4. Lack of random mating

Q. At a particular locus, frequency of allele A is $0.6$ and that of allele a is $0.4$. What would be the frequency of heterozygotes in a random mating population at equilibrium?

1. $0.36$
2. $0.24$
3. $0.48$
4. $0.16$

Q. In a population with two alleles for a gene locus (P and p), the allele frequency of P is 0.7. What would be the frequency of heterozygotes if the population is in Hardy-Weinberg equilibrium?

1. 0.49
2. 0.42
3. 0.21
4. 0.09

Q. The ability to taste the bitter chemical PTC is inherited as a simple dominant trait. In a population of 1000 biology students, 640 of them are PTC tasters. What proportion of this population are non-tasters?

1. 0.64
2. 0.08
3. 0.06
4. 0.36
5. 0.42

Q. Answer in 40 to 80 words:
State Hardy-weinberg principle. Mention any two factors that affect Hardy-Weinberg equilibrium.

Q. In a random mating population frequency of recessive allele is $0.5$. What is the frequency of dominant phenotypes in population?

1. $0.25$
2. $0.50$
3. $0.75$
4. $0.20$

Q. Hardy Weinberg equation is

1. $p^2+2pq+q^2=1$
2. $p+q=4$
3. $p+q^2+2pq=1$
4. $p+2pq+q=1$

Q. Write two factors affecting Hardy - Weinberg principle.

Q. Hardy-Weinberg equilibrium is influenced by gene flow, genetic drift, mutation, genetic recombination and :

1. Evolution
2. Over-production
3. Limiting factor
4. Natural selection
5. Saltation

Q. According to Hardy-Weinberg equilibrium, the allelic frequencies in a population will remain constant from generation to generation under which of the two conditions?
(a) Large population size
(b) Non-random mating
(c) There should be differential success among the organisms of the poppulation
(d) There should be no mutation or large scale migrations

1. (a) and (b)
2. (b) and (c)
3. (a) and (c)
4. (a) and (d)

Q. State the Hardy-Weinberg law.

Q. In a random mating population, frequency of disease causing recessive allele is 80%. What would be the frequency of carrier individual in population?

1. 64%
2. 32%
3. 16%
4. 100%

Q.

What forces contribute to genetic evolution?

Q. What is evolution according to Hardy- Weinberg?

Q. Any change in the gene pool or allele frequencies present in a population results in :

1. Evolution
2. Deletion
3. Gene mutation
4. Polymorphism

Q. A population will not exist in Hardy-Weinberg equilibrium if

1. There is no migration.
2. The population is large.
3. Individuals mate selectively.
4. There are no mutations.