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
Flura [38]
3 years ago
8

People who are tune deaf are unable to follow a rhythm. Scientists have evidence that tune deafness can be genetic. The pedigree

below traces the inheritance of tune deafness in a family. Individuals in the pedigree are numbered.

Biology
1 answer:
butalik [34]3 years ago
5 0

Question

Pedigree attached

a. Provide evidence from the pedigree that conclusively shows that the tune deafness allele is autosomal dominant, not autosomal recessive. Explain your reasoning.

b. Identify the genotypes of individuals 5 and 6, and then draw the Punnett square for the cross of these two individuals.

c. Compare the expected percentage of each phenotype of the offspring from the cross in part (b) with the actual percentage of each phenotype observed in the children of individuals 5 and 6.

Answer/Explanation:

a. Autosomal dominant means that even having one copy of the allele T will produce a tune deaf individual. The evidence of this is that individuals II.3 and 4 have children (III. 8 and 9) with normal tune perception. This suggests that they have inherited the normal allele from both parents. That means II.3 and II4 must be heterozygous, in order to pass on the normal allele. This makes sense if tune deafness is dominant (because 3 and 4 will both be Tt and Tt, so can pass on the t alleles). However, if tune deafness was recessive, that would mean that individual II 3 and 4 both have to carry 2 copies, meaning there is no way their children would have normal tune perception.

b. Since individual 5 is unaffected and we know this is the recessive trait, they must be Tt. Since individual 6 is affected, they must be either Tt or tt. However, they have children who are unaffected (11, 12, 13) who must be tt. This means, individual 6 must have the t allele to pass on, and must be Tt. Therefore, the cross between individuals 5 and 6 is tt x Tt:

         T        t

t        Tt       tt

t       Tt       tt

c) The punnet square shows the children from (b) have a 50:50 chance of being tune deaf vs normal tune perception (50% each). In contrast, the actual ratios are 25% tune deaf to 75% normal tune perception. (1:4). This deviates from the expected ratio, but since all of these are due to chance, it is not an unexpected occurrence. Perhaps if there were 10, 50 or 100 children (!) from this cross, the results would be more like the expected ratio

You might be interested in
Describe conditions that may result in the clumped dispersion, uniform dispersion, and random dispersion of populations.
KIM [24]

Answer:

The dispersion pattern of the population depends on the type of the population and their distribution in the environment. Different types of dispersion are uniform, random and clumped.

The uniform dispersion occur when the population is evenly spaced out in the area. Random dispersion is independent of the other individuals and randomly spaced. Clumped dispersion is greatly influenced by the behavior and the resources. Population are present in small patches.

5 0
3 years ago
Read 2 more answers
Which human activity creates the least threat to global stability
8_murik_8 [283]
The human activity that creates the least threat to global stability is : Reuse of Plastic bags.
Plastic bag need a lot of time to be degraded in the soil which will create a threat to the environment. Reusing plastic bag will reduce this threat.

hope this helps
5 0
3 years ago
Water and land has formed on earth, but why is life still impossible?
Nastasia [14]

Answer: because of the pandimic

it startExplanation: coronvires is the probelm over 4 years it started in 2019 to 2022 it even more year well never know.

7 0
2 years ago
Read 2 more answers
Using energy as the factor, what case can be made for eating vegetarian?
Shkiper50 [21]

Explanation:

One of the benefits of a vegetarian diet is a reduction in your impact on the environment. Animals store only a small fraction of the energy they extract from the food they eat, and the rest is wasted as heat.

6 0
2 years ago
Would a large hyena population exist?
andrew11 [14]

Answer:

No

Explanation:

The spotted hyena (Crocuta crocuta Erxleben) and the lion (Panthera leo Linnaeus) are two of the most abundant and charismatic large mammalian carnivores in Africa and yet both are experiencing declining populations and significant pressures from environmental change.

6 0
2 years ago
Other questions:
  • Describe how proteins synthesized in a cell are packaged, modified, and exported out of the cell. Be sure to include the contrib
    10·1 answer
  • What is in every organ
    14·2 answers
  • Explain how a shortage of water affects the health of your cells.
    13·2 answers
  • Which of these items would be a renewable resource?
    5·2 answers
  • Which statement represents a characteristic of an ecosystem that is not likely to sustain itself
    10·1 answer
  • What usually attaches the kidneys to the retroperitoneum?
    10·1 answer
  • Contrast energy transfer with energy transformation.​
    11·1 answer
  • Please Help!!!! A plant without enough water may wilt and close its stomata (leaf openings). This decreases the rate of photosyn
    12·2 answers
  • The inner calcium matrix of a sea urchin is called what?<br> mantle
    10·1 answer
  • What can happen to an electron when sunlight hits it.
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!