Question

Which of the following is the source of new, novel alleles in a population?

A) mutation

B) crossing over in meiosis

C) gene flow

D) mitosis

What does it mean for a population to be in Hardy-Weinberg equilibrium?

Multiple Choice

• There are no changes in gene frequencies from one generation to the next.

• Natural selection is occuring and selecting a particular phenotype in the population.

• Evolution is occurring in the population.

• Allele frequencies in the population are occurring over time.

In a sample population of people, 36% have the recessive trait of "free" earlobes (q2). What is the frequency of the dominant allele for attached earlobes, p?

Multiple Choice

• 0.40

• 0.64

• 0.10

• 0.24

Answer 1

1.

Mutations are the source of new, novel allles in a population.

Mutation is a random process,which brings changes in nucleotide sequences of organism' s DNA. It is the main source of new alleles or novel alleles in a population.

* Novel alleles are the product of Mutations.

Other options are incorrect. Gene flow is the flow of alleles into or out of a population. Mitosis is the equational division which helps in growth of body. Crossingover in meiosis is the exchange of segments of two chromosomes.

Option A is the answer.

MUTATION is the answer.

2

Hardy Weinberg Equilibrium is a state when genetic variations in a population remain constant from one generation to the next. Here allele/ gene frequencies and genotype frequencies remains constant. Here the population is not evolving.

The correct statement is - There are no changes in gene frequencies from one generation to the next.

Other options are wrong. Allele frequencies donot change over time. There is no evolution or selection of a particular phenotype.

Option A is the answer.

3.

In a sample population 36 % have recessive trait of free ear lobes

q2 = 36 %

q = 0.6

We know that p + q = 1

q = frequency of recessive allele

p = frequency of dominant allele

p= 1 - q

= 1- 0.6

= 0.4

Frequency of dominant allele for attached ear lobes, p =0.40

So the answer is 0.40