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
djyliett [7]
2 years ago
15

Crossing over occurs when

Biology
2 answers:
Svet_ta [14]2 years ago
3 0
Correct answer:
"<span>B- homologous chromosomes join together to form tetrads during prophase I"

</span>It is during prophase I that homologous chromosomes join together (<span>synapsis)</span> and form tetrads - four chromatids are together in the new structure of two chromosomes - and this is the reason why crossing-over occurs in this phase. It is in this tetrad that both arms of both chromosomes may crossover and matching regions exchange places. This process results in homologous chromosomes recombination leading to genetic variability. 
I am Lyosha [343]2 years ago
3 0

The correct answer is B: homologous chromosomes join together to form tetrads during prophase I

You might be interested in
Duration of hypotension before initiation of effective antimicrobial therapy is the critical determinant of survival in human se
nydimaria [60]

The goal is to find out how often effective antimicrobial therapy is delayed after the start of persistent or recurrent hypotension in septic shock and how this affects mortality.

Design: A cohort research that was conducted in retrospect between July 1989 and June 2004.

Setting: Ten hospitals (four academic, six community) and fourteen critical care units (four medical, four surgical, and six combined medical/surgical) located in Canada and the United States.

Patients: The 2,731 adult patients with septic shock listed in their medical records.

Measurements and key findings: Survival to hospital discharge served as the primary outcome indicator. A survival percentage of 79.9% was found when an antibiotic efficacious for isolated or suspected infections was administered within the first hour of verified hypotension. Over the following 6 hours, each hour of antibiotic delivery delay was linked to an average 7.6% decline in survival. When compared to obtaining treatment within the first hour after the beginning of persistent or recurrent hypotension, the in-hospital mortality rate was considerably higher by the second hour (odds ratio 1.67; 95% confidence range, 1.12-2.48). The single best predictor of outcome in multivariate analysis (which included Acute Physiology and Chronic Health Evaluation II score and treatment factors) was time to the start of effective antimicrobial therapy. It took 6 hours on average to start effective antimicrobial therapy (25-75th percentile, 2.0-15.0 hrs).

Conclusions: In adult patients with septic shock, effective antibiotic therapy during the first hour of confirmed hypotension was related with enhanced survival to hospital discharge. Only 50% of patients with septic shock got efficient antimicrobial therapy within 6 hours of being diagnosed with proven hypotension, despite a steady rise in fatality rate with increasing delays.

<h3>What is septic shock?</h3>

Septic shock is a potentially fatal illness that develops after an infection when your blood pressure drops to an unsafely low level. The infection might be brought on by any kind of bacterium.

To learn more about septic shock with the help of given link:

brainly.com/question/4235870

#SPJ4

7 0
1 year ago
PLESE HELP!!!!!!!!!!!!!!!!!!Based on this image, what is responsible for the pattern of ocean currents?
Juli2301 [7.4K]
Your answer will be earth rotation (a)
7 0
3 years ago
Read 2 more answers
Which organisms have the fewest similarities? Explain why these organisms still qualify as living things despite sharing few cha
VladimirAG [237]

Plants have the fewest similarities with the other two groups of organisms.

<h3>Plants vs animals</h3>

Plants generally comprise all living organisms that have chlorophyll and are able to manufacture their own foods by photosynthesis.

Animals, on the other hand, are living organisms that cannot manufacture their foods and are mobile. Animals are either vertebrates or invertebrates.

Plants qualify as living organisms because they are able to feed, excrete, reproduce, grow, respond to stimuli, die, and carry out other basic characteristics of living organisms.

More on plants and animals can be found here: brainly.com/question/5018082

#SPJ1

6 0
1 year ago
Define : Control group
AURORKA [14]

Answer:

here is ur answer

Explanation:

The control group is defined as the group in an experiment or study that does not receive treatment by the researchers and is then used as a benchmark to measure how the other tested subjects do.

8 0
3 years ago
What is the symbol for copper
Nadya [2.5K]

Answer:

CU, in the periodic table. Stomic number 29.

3 0
3 years ago
Read 2 more answers
Other questions:
  • 2 a) What biotic factors affect the earthworm ​
    7·1 answer
  • Describe two examples of steroids and their physiological function.
    7·1 answer
  • Which of the following is principally responsible for water cycling in plants?
    12·2 answers
  • How is water necessary for the structure of a green plant?
    13·1 answer
  • Which vitamin can be synthesized in significant amounts by humans and, therefore, may NOT be essential
    10·1 answer
  • The larval forms of a tapeworm are known as ________.
    9·1 answer
  • Most plants absorb the nitrogen they need from the soil.<br><br> True<br> False
    15·1 answer
  • A researcher crossed two plants, and informed an assistant researcher to determine the genotypes and phenotypes of the plants th
    10·1 answer
  • Answer all 3 for brainliest im giving alot of points
    15·1 answer
  • Design a conceptual or theoretical to explain how the environment climate change has changed over time and to mitigate these cha
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!