1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
-BARSIC- [3]
3 years ago
7

Consider two different traits in mice affecting tail length and fur color. A two-factor cross was made involving true-breeding m

ice with short tails and white fur to wild-type mice with long tails and brown fur. All F1 offspring had long tails and brown fur. The F1 offspring were then crossed to mice with short tails and white fur. The following phenotypic results were obtained:
118 long tails, brown fur 77 long tails, white fur 114 short tails, white fur 81 short tails, brown fur

Required:
Construct a null hypothesis about these two genes and the expected ratios of the offspring from the cross.
Biology
1 answer:
Stells [14]3 years ago
8 0

Answer:

See the answer below

Explanation:

Null hypothesis: The two genes are independently assorting and therefore, are not linked to each other.

Let A represents the allele for tail length and B for fur color. Long-tail A is dominant over short tail a while brown fur B is dominant over white fur b.

For the first cross involving true-breeding mice:

    AABB   x   aabb

F1         AaBb (long tails and brown fur)

For the second cross:

      AaBb   x   aabb

4 AaBb - Long-tail, brown fur

4 Aabb - Long tail, white fur

4 aaBb - short tail, brown fur

4 aabb - short tail, white fur

Since the phenotypic ratio from the cross is 1:1:1:1, if the null hypothesis was to be true, it means that the expected phenotype ratio should be 1:1:1:1.

In order to test this hypothesis, we use Chi-square:

phenotype                           O            E                 X^2  

Long-tail, brown fur           118          97.5        \frac{(118-97.5)^2}{97.5} = 4.31

Long tail, white fur              77           97.5             4.31

short tail, brown fur             81           97.5              2.79

short tail, white fur              114           97.5              2.79

Total                                                                          14.2

Degree of freedom = 4 - 1 = 3

Critical Chi-square value = 7.815

The calculated Chi-square value is more than the critical value, hence, the null hypothesis is rejected.

You might be interested in
Match each energy source with the correct description
Andru [333]

wood- renewable resource that can be burned

oil- spills can destroy aquatic ecosystems

hydroelectric power- uses the kinetic energy of water

nuclear power- creates radioactive waste

coal- burning releases CO2 into the air

8 0
3 years ago
An energy transformation is
Sonbull [250]
Energy can not be created nor destroyed, leaving the only possible answer to be "b," when energy changes from one form to another.
3 0
3 years ago
What are two important fuels that comes out of the oil refining process?
goldfiish [28.3K]
Many fuels can come out of the process, such as gasoline, kerosene, diesel fuel, liquified petroleum gas, and jet fuel.
6 0
3 years ago
What system controls the body by means of chemical molecules called hormones?
AysviL [449]
It would be the endocrine system. 
7 0
3 years ago
What possible alternatives could have been proposed to develop tourism in Coron?
statuscvo [17]

Some alternatives to develop tourism in Coron are:

  • Increase advertising
  • Improve local infrastructure
  • Greater investment in the tourism sector
  • Worker training

The island of Coron is located in the Philippines, making it an ideal location for ecotourism, with an emphasis on dives to view wrecks from World War II.

Therefore, to promote tourism in this region, there must be investment in the sector, where there is an ideal infrastructure to receive travelers with safety and quality.

It is also important to train workers to welcome travelers and also to develop a tourism development plan that will generate greater publicity and knowledge of Coron's sights.

Learn more here:

brainly.com/question/12166763

6 0
3 years ago
Other questions:
  • Why do our classification systems change?
    14·1 answer
  • Nuclear power is an example of an alternative energy source that has greater negative environmental impacts than the burning of
    7·2 answers
  • What part of the brain controls breathing and heart rate?
    11·1 answer
  • How might the introduction of a mouse predator help with the mouse problem in australia
    14·2 answers
  • Based on the table, which domains contain only one cell type?
    6·1 answer
  • A dad is heterozygous for Type B blood, while mom has Type AB blood. What is the
    10·1 answer
  • How does speed relate to a change in position over time?
    14·1 answer
  • What could happen to an organism when it’s dna mutates
    9·1 answer
  • PLEASE HELP ASAP ;-;
    14·2 answers
  • The picture represents a structure of the respiratory system.
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!