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
Write the number of each atom in the chemical formulas for all of the possible combinations of positive and negative ions found
adell [148]

A chemical formula is obtained from the number of atoms in a compound.

Chemical compounds are composed of atoms. The number atoms of each element in a compound determines the correct formula of the compound. Before I can write the chemical formula of any compound, I must first determine the number of each atom in the compound.

For instance, phosphorus trichloride contains one atom of phosphorus and three atoms of chlorine hence I would place a 1 in the box for P and 3 in the box for Cl.

Learn more: brainly.com/question/17429336?

5 0
3 years ago
Why are the fields of science, technology, engineering, and math important in the modern world?
Katyanochek1 [597]

Explanation:

  1. This is 21st century .In this time our society as well as all of the world had become advanced and modern.So,in this time if we started to work without any technology then while working we need more manpower and our time will be loss.Science ,technology,engineering and maths play important role in modern world d .It helps in sustain able development and helps any country to be self dependent and makes profit by which Nations will be developed and it helps to win the future.
  2. Hope is useful for you.have a nice day.
4 0
2 years ago
Why doesnt pepsin, the enzyme released in the stomach to
Fiesta28 [93]

Answer: unfavourable ph condition for the pepsin

Explanation: during digestion, enzymes are needed to aid the process.digestive enzymes are biological catalyst that breakdown large food particles into digestible form .

As biological catalyst, enzymes require an optimum temperature and pH condition.outside this temperature or pH,the enzyme is denatured.

In the stomach, hydrochloric acid is required to convert pepsinogen into it's active form,pepsin.the acid also creates an optimum low pH that pepsin needs to function.

As the food moves to the small intestine,the pH is alkaline and is unfavourable for pepsin to function.

4 0
3 years ago
A fault is ____. (1 point) a place on Earth where earthquakes cannot occur a fracture in the Earth where movement has occurred t
MrRissso [65]

A is the answer I took this trust me

4 0
3 years ago
What form does carbon take after cellular respiration
IRISSAK [1]

Answer:

Cellular respiration is the aerobic process by which living cells break down glucose molecules, release energy, and form molecules of ATP. Overall, this three-stage process involves glucose and oxygen reacting to form carbon dioxide and water.

Explanation:

Hope this helps! :))

8 0
3 years ago
Other questions:
  • In pea plants, the gene for round seed (R) is dominant, and wrinkled seeds (r) are recessive. The endosperm of the pea is also e
    15·1 answer
  • Help plsssssssssssssssss
    13·1 answer
  • Which of the following is not a macromolecule?
    10·1 answer
  • What are some characteristics that all animals share?
    7·2 answers
  • What kind(s) of cells can develop from pluripotent stem cells?
    11·2 answers
  • Why do you think it is so hard to get people to change their behavior?
    9·2 answers
  • Which occurs during the translation?
    11·2 answers
  • The creation of genetically identical offspring by a single parent, without the participation of sperm and egg, is called The cr
    10·1 answer
  • Which of these is a drawback of growing a crop that has been genetically modified to
    15·1 answer
  • What is the basic unit of classification and is denoted by a unique two-part scientific name?.
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!