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
LiRa [457]
4 years ago
14

25 POINTS!!! Seth is chatting with his friends in a café. Suddenly, the power goes off, and it’s completely dark. After a few mo

ments, he’s able to see the outlines of the objects and people nearby. Which cells are responsible for his ability to see the objects and people?
A. cone
B. glial
C. olfactory
D. rod
Biology
1 answer:
Sveta_85 [38]4 years ago
7 0

It's the rod cells that see better in dim lighting, so D

You might be interested in
Review the following DNA sequences .
Alla [95]
If you compare the original DNA with the mutated DNA, the first C got “substituted” by an A after the mutation.

So the answer is (C) substitution.
6 0
3 years ago
Read 2 more answers
Consider a species of sparrow that originally lived only in Alaska but recently expanded its range through North America, then C
Shtirlitz [24]

Answer:

North America is the one with the highest heterozygosity frequency for most loci, followed by Central America, and finally, South America with the lowest heterozygosity level.  

Explanation:

Some different forces or mechanisms might alter H-W equilibrium and lead to evolution, such as mutation, natural selection, migration, and genetic drift.

In the exposed example, we have a species of sparrow that migrates from Alaska to North America. Migration is unidirectional, which means that the movement occurs in only one direction: from Alaska to North America. We should also consider that the first immigrants colonized the area for the first time, meaning that there was not a receiving population of the same species already established. Finally, we need to consider that Alaska´s environmental conditions are very different from North America´s environmental conditions.

When a species arrives at a new place, it needs to adapt. The establishment and dispersion of the species in the new area depend on previous adaptation. So, when the firsts sparrow individuals arrived in North America, they faced new environmental conditions that acted as selective pressures that drove to the occurrence of mutations. A mutation implicates a stable and inheritable change in the genetic material. A mutation introduces changes, new alleles in the population, variability. But mutation rates are very low and have no evolutive direction, so they need another force to increase or decrease the mutant allelic frequencies. Natural selection benefits new advantageous alleles and transmits them to new generations changing their relative frequencies. <em>So, sparrows arrive in North America, mutated, and natural selection favored the beneficial mutations leading to a better adaptation to the environment.</em> This means that the heterozygosity level in this new recent population is very high.

As animals adapt to the new habitat and have better dispersal genes, they get to disperse even more. So they start new migration south, to Central America and South America. Again, they are moving to new regions with new conditions, and to establish they need to suffer new adaptations. But remember that we are talking about a recent event in time. Probably the animals migrating south are just a few.  They have not spent enough time yet in the new area, to adapt to the new environment and to include new genes into their population. What is even more, as they are a small new population moving south, they are more vulnerable to genetic drift events. Genetic drift acts on a population decreasing the variability between individuals, hence, decreasing the heterozygosity. <em>This small population suffers low mutation, has not enough time to establish, and is more vulnerable to genetic drift events.</em> The heterozygosity level is probably inferior to North America´s one.

Comparing the three areas, we could say that North America is the one with the highest heterozygosity frequency, followed by Central America, and finally, South America with the lowest level of heterozygosity.

8 0
2 years ago
A somatic cell containing a diploid chromosome number of 24 undergoes mitosis. each daughter cell will have _____ chromosomes. 4
ANEK [815]
Each daughter cell will have

12 chromosomes
3 0
3 years ago
A diagram of the male reproductive system is shown.
tester [92]

Answer:

Where's the diagram?????

6 0
2 years ago
When organisms reproduce sexually, the species number of chromosomes 1
Zanzabum

Answer:

the option will be meiotic call division

5 0
3 years ago
Other questions:
  • Using at least two examples, explain how the process of evolution is revealed by the imperfections of living organisms.
    15·1 answer
  • What is a reasonable action that provides safer water for communities?
    11·1 answer
  • Two factors which cause global climate change are listed below.
    12·1 answer
  • Dr. Winters decides not to tell the people in his experiment about the potential risks:
    14·1 answer
  • Which of the following is not a function of astrocytes?
    5·1 answer
  • How does limestone formate?
    7·2 answers
  • What science aims to discover solutions to practical problems?
    11·1 answer
  • Which of the following is a cost of mining aluminum from new bauxite
    15·2 answers
  • Larry is a business owner who has made a practice of sending holiday cards
    15·2 answers
  • What is globalization?​
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!