Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Biology Expert

Background
The Hardy-Weinberg law states two things:
1. If no outside forces are acting on the population, then the allele frequency will remain constant from one generation to the next.
2. If no outside forces are acting on the population, then the genotype frequencies will be p^2, 2pq, and q^2.

The converses of these statements are not necessarily true; that is, the following statements are FALSE:
1. If the genotype frequencies are p^2, 2pq, and q^2, then no outside forces are acting on the population.
2. If the genotype frequencies remain constant from one generation to the next, then no outside forces are acting on the population.

The following two problems will illustrate the falsehood of these statements.

1. Consider a single locus with the following relative fitnesses. Let the initial p=.50, and assume random mating. Ignore mutation, migration, and genetic drift.

Genotype AA Aa aa
# of zygotes 1 .90 .81

a. find out the genotype frequencies in the population of zygotes (before selection).
b. What is the allele frequency in this population of zygotes? (No calculations allowed)
c. find out the genotype frequencies in the population of adults (after selection).
d. find out the allele frequency in this population of adults.

Now assume that you know nothing about the fitnesses or the allele frequencies, and that you have just sampled this population of adults. You find the following numbers:

AA Aa aa
14 25 11

e. find out the observed frequencies.
f. find out the expected genotype frequencies, assuming the Hardy-Weinberg conditions hold.
g. Compare e and f. Do the adult genotype frequencies fit in the Hardy-Weinberg equations?
h. Would you be able to detect natural selection if you sampled only the adults? What if you sampled both zygotes and adults? describe.

2. Now consider another locus, with the following fitnesses. Let the initial q=.25, and assume random mating. Ignore mutation, migration, and genetic drift.

These problems are solved.

Genotype BB Bb bb
Fitness .90 1 .70

a. find out the allele frequency after one generation. After two generations.
b. Must natural selection cause the allele frequencies to change? describe.

Biology, Academics

  • Category:- Biology
  • Reference No.:- M928196

Have any Question? 


Related Questions in Biology

One more as soon as possible if you can please thank youthe

One more, as soon as possible if you can please! Thank you The technical advances covered in Chapter 15 are creating a host of medical and moral issues that we will all have to confront. Briefly discuss the four major as ...

Select at least 2 cell structures what hypothesis could you

Select at least 2 cell structures. What hypothesis could you form to explain what would happen to the cell or the organism if each cell structure were damaged or destroyed?

Use the following link Use the following link

Use the following link (http://www.ted.com/playlists/144/should_we_redesign_humans) to access a playlist of videos oncurrent developments in synthetic biology. Choose three videos to watch, and write a case study of at l ...

Lets say that robert baratheon despite being king was

Let's say that Robert Baratheon, despite being king, was unlucky enough to be heterozygous from Huntington's disease and heterozygous polycystic kidney disease-2 (caused by a mutation in the Polycystin-2 gene). However, ...

Individual assignment instructionsthe global community is

Individual Assignment Instructions The global community is plagued by increasing incidence of lung cancer, colorectal cancer, breast cancer, pancreatic cancer, prostate cancer, leukemia, non-Hodgkin lymphoma, liver cance ...

Explain why the removal of great sharks poses a threat to

Explain why the removal of great sharks poses a threat to bay scallops on the Atlantic Coast of North America, despite the fact that large sharks do not feed on scallops. Include the concept of a trophic cascade in your ...

Imagine two parents are both heterozygous for two autosomal

Imagine two parents are both heterozygous for two autosomal genes. Assuming independent assortment, what proportion of their offspring are expected to have the same phenotype (for these two traits) as the parents? A) 0.2 ...

What involves the fusion of the two nuclei in the

What involves the fusion of the two nuclei in the dikaryotic cell to form a single diploid nucleus?

Challenge question how might having gene regulatory

Challenge question: How might having gene regulatory proteins act as hetero-and homo-dimers allow "combinatorial control" which increases the number of different genes regulated by these proteins? (Hint: remember that th ...

Most mutations are thought to be deleterious why then is it

Most mutations are thought to be deleterious. Why, then, is it reasonable to state that mutations are essential to the evolutionary process?

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

Section onea in an atwood machine suppose two objects of

SECTION ONE (a) In an Atwood Machine, suppose two objects of unequal mass are hung vertically over a frictionless

Part 1you work in hr for a company that operates a factory

Part 1: You work in HR for a company that operates a factory manufacturing fiberglass. There are several hundred empl

Details on advanced accounting paperthis paper is intended

DETAILS ON ADVANCED ACCOUNTING PAPER This paper is intended for students to apply the theoretical knowledge around ac

Create a provider database and related reports and queries

Create a provider database and related reports and queries to capture contact information for potential PC component pro

Describe what you learned about the impact of economic

Describe what you learned about the impact of economic, social, and demographic trends affecting the US labor environmen