Q.2. Describe the different phases of meiotic prophase – I. Mention the chromosomal events during each stage.
Prophase-I occurs over a long duration and involves several complicated changes in meiotic cell division. It is important because genetic recombineiion and variation in sexually reproducing organism occurs due to the events of this phase.
EXPLANATION:❈ Leptotene —
➥ The chromatin network opens out and threads become clear.
➥ The chromosomes are thin, slender and long.
➥ Chromosome number is diploid.
❈ Zygotene —
➥ Corresponding chromosomes become intimately associated.
➥ The process of pairing is known as synapse. It is so exact that pairing is not merely between corresponding chromosomes but between corresponding individual units.
➥ The chromosomes become shorter and thicker.
❈ Pachytene or Pachynema —
➥ The synaptic chromosomes become very intimately associated.
➥ The pair of chromosomes becomes short and thick.
➥ Crossing over occurs at this stage. Chiasmata are clearly seen.
❈ Diplotene —
➥ Homologous chromosomes start separating from one another.
➥ Chiasmata tend to slip out of the chromosomes. This is known as terminalisation of chiasmata.
➥ Chromosomes start separating out but the separation is not complete.
➥ Nuclear membrane and nucleolus start disappearing.
❈ Diakinesis —
➥ The bivalents condense further and get randomly distributed.
➥ The separation of paired chromosomes is almost complete.
➥ Terminalisation of chiasmata is almost complete.
➥ Nuclear membrane and nucleolus disappear.
i need it fast
After chewing foods like rice, potato and bread, for a while, we can feel a mild
sweet taste. Give reason for this.
dude, you asked brainly the whole worksheet?? Do it yourself sreerag!!
The nucleus contains______
Answer:
If you're talking about the cell: The nucleus contains the cell's chromosones
If you're talking about the atom: The nucleus contains protons and neutrons.
Explanation:
Have a good day :)
Please I need major help! Help me please?!?
Why do you think it would be important to know that both sides of the heart receive blood at the same time? Giving Brainliest
Explanation:
The right side of your heart receives blood from the body and pumps it to the lungs. The left side of the heart does the exact opposite: It receives blood from the lungs and pumps it out to the body. If your body didn't do it simultaneously, then blood would overflow your lungs.
The state of Illinois has a law that requires 25% of electricity in the state 2 be produced by renewable energy sources by the year 2025. This law is an example of
a. Green pricing
b. A renewable portfolio
c. An Energy Star promotional program
Answer:
b. A renewable portfolio
Explanation:
A renewable portfolio refers to the policies that are designed to increase the use of renewable energy sources for electricity generation. These renewable energy sources such as water, wind and solar radiation etc are used for the generation of electricity and also to reduce pollution in the environment. These renewable energy sources are present unlimited or in huge amount in our environment so its usage is beneficial for both humans and environment.
What type of reproduction involves forming offspring from two
parents?
a Asexual
b Sexual
C Mitosis
int?
d Replication
Answer:
Sexual
Explanation:
Sexual reproduction involves two parents and produces offspring that are genetically unique. During sexual reproduction, two haploid gametes join in the process of fertilization to produce a diploid zygote. Meiosis is the type of cell division that produces gametes.
Hope it helps
Answer: Sexual, I believe.
Explanation:
If it were Asexual, it'd only involve one parent. Mitosis has daughter cells have the same number of chromosomes as parent cells (heavy emphasis on cells as in plural cells.) And replication is just copying a cell.
Forgive me if I'm wrong!
Eukaryotes contain _______________________
A. membrane-bound organelles.
B. toxins.
C. cell lipozyroids
Answer:
A. membrane-bound organelles.
Explanation:
Answer:
A is your answer
Explanation:
A bacterium is made of _____ cells.
Answer:
prokaryotic cells
Explanation:
Why are organisms that reproduce sexually less likely to accumulate deleterious mutations ?
GIVING BRAINLIEST!!!!!!
A student made a table to show information about the physical structures and organs of birds. What statement best describes how to correct an error in the table?
The feathers support the body.
The feathers help the bird move.
The ovaries produce the eggs.
The ovaries produce the sperm.
Both naturally acquired and artificially acquired immunity are effective ways to gain immunity. Which method is safest?
Answer:
naturally acquired immunity are effective ways to gain immunity.
Explanation:
there is a saying that eat your food like a medicine otherwise you will neex to ead your medicine as food.so food whuch we obtain from nature have many nutritious values than artificially acquired medicine
how many types of enzyme does pancreas secrete and name them
━━━━━━━━━━━━━━━━━━━━━━━
CORRECT QUESTION -How many types of enzyme does pancreas secrete and name them!
CORRECT SOLUTION -The pancreas consist of exocrine glands that produces enzymes making digestion playing an important role . The enzymes made by the pancreas include :
Pancreatic proteases (such as trypsin and chymotrypsin) - which help to digest proteins .Pancreatic amylase - which helps to digest sugars (carbohydrates) .Pancreatic lipase - which helps to digest fat .━━━━━━━━━━━━━━━━━━━━━━━
A student makes a model of an atom, as shown. Where should the student place a proton in the model?
A. Inside the nucleus
B. On either of the two orbits
C. Between the two orbits
D. Between the first orbit and the nucleus
how genes control many of the characteristics of the organisms? answer asap pls
Answer:
To summarize, two things determine the traits an organism has: its genotype and the dominance or recessiveness of the alleles it has. Some traits, like flower color in peas, are controlled by a single gene, but ultimately many if not most traits in an organism are controlled by more than one gene
Explanation:
What happens during translation? *
A.) The cell uses information from mRNA to produce proteins.
B.) tRNA is made from mRNA.
C.) mRNA is made from DNA.
Answer:
What happens during translation? tRNA is made from mRNA.
Explanation:
Option B) is your answer. Have a great day.
What is the vent in earths surface through which magma and gases are expelled
Answer:
A volcano
Explanation:
Is a vent or fissure in the Earth's surface through which molten rock and gases are expelled. Molten rock is called magma.
Which central idea of the article is MOST
supported by this paragraph?
А
African crested rats use poison from tree bark
as a type of defense.
B
African crested rats have many natural
predators in their woodlands habitat.
Scientists
want to increase conservation efforts
to protect crested rats.
D
Scientists are just beginning to leam about the
behaviors of crested rats
Which sentence best supports the idea
that fossils help us learn more about
the history of the earth?
Natural geological processes
bring layers of rock to the
surface.
Most animals of our past did
not fossilize.
wit
Speac
The largest dinosaur fossil
ever found was of a
Brachiosaurus.
sroamed the
posed to
slowly
d, the remains
Paleontologists know about
the diversity of life that has existed since the beginning of time
Answer:
D the remains Paleontologists know about the diversity of live that has existed since the beginning of time
Explanation:
fossils assist in understanding of evolution throughout the billions of years that the earth has housed living beings. it allows us to even date history
Are data that do not support a hypothesis useful?
A. Yes, because the data prove that the experiment was designed
poorly
B. Yes, because the data provide useful information that can lead to
more testing
C. No, because the data show that the experiment failed
D. No, because the data must be inaccurate
1. Elaborar resumen del texto sobre los estados de la materia( usar alguna estrategia: mapa mental, conceptual, historia, cuento)
Answer:
Sólido, líquido, gas y plasma.
Explicación:
Materia son las sustancias que ocupan espacio y tienen peso. Hay cuatro estados de la materia, es decir, sólido, líquido, gas y plasma. Todos los materiales presentes en este universo en estos cuatro estados. Los estados de la materia cambian con el aumento o la disminución de la temperatura del material. si la materia sólida se calienta, se derrite y cambia a estado líquido y luego gaseoso mientras que, por otro lado, la temperatura decreciente conduce a la condensación y congelación de la materia que causa el cambio de estado gaseoso a líquido y sólido. El plasma está formado por un gas de iones, átomos o moléculas.
What percentage of the offspring are green , if you crossed a heterozygous pea plant with another heterozygous
pea plant?
50%
O 75%
O 25%
O 100%
Answer:100 percent
Explanation: This is because if both P plants are heterozygous both of them are caring an equal amount of genes hence they have and are 100% P plant heterozygous
Madison is looking at a cell under the microscope. The organism has only one cell, and it has a nucleus and membrane bound organelles. It has no cell wall and uses flagella for movement. In which kingdom should this organism be classified?
Answer:
Protista. hope this helps!!! (my answer might be wrong)
Ok, do we live in or on earth?
Answer:
On, we live on the surface of Earth.
If we lived in it, we'd be near the core, or literally inside the earth's many layers.
Hope that helps! :)
-Aphrodite
Explanation:
When are chromosome mostly condensed
Metaphase is a stage of mitosis in the eukaryotic cell cycle in which chromosomes are at their second-most condensed and coiled stage (they are at their most condensed in anaphase).
When sea ice melts, the liquid sinks and begins to move along the ocean floor. What is formed by this process?
Answer:
`
Explanation:
which of these statements about the stars' apparent motion in the night sky are true? choose all that apply ( it could be more than one answer)
A. The orbit of stars around the sun causes stars to appear to move in the night sky.
B. The orbit of stars around the center of the galaxy causes stars to appear to move in the night sky
C. The rotation of earth on its axis causes stars to appear to move in the night sky.
D. The orbit of earth around the sun causes stars to appear to move in the night sky.
i have 1 hour left
List all the biotic and abiotic factors in figure 4
Answer:
1
Explanation:
PLEASE HELP!!!! You discover a new protist species. It has chloro-
plasts and vacuoles and moves using a flagellum.
How would you classify the way that it gets energy?
Is it an autotroph, heterotroph, or both? Explain
your answer.
Answer:
Autotroph
Explanation:
An autotrophic organism is any organism that is capable of synthesizing its own food either by using sunlight (photosynthesis) as an energy source or chemicals (chemosynthesis). An organism capable of photosynthesis must possess CHLOROPLAST (CHLOROPHYLL), which is responsible for capturing sunlight in the cell and also harbors the photosynthetic process.
According to this question, a newly discovered protist is said to have chloroplasts and vacuoles and moves using a flagellum. Due to the fact that this protist possess CHLOROPLAST organelle, it means it can perform photosynthesis, which is one of the ways an autotrophic organism synthesizes it's food. Hence, the organism is AUTOTROPHIC.
An allele arises in a population that helps individuals digest cellulose. While the allele starts in only one organism, it increases in allele frequency because it allows organisms that carry it to reproduce more. What is this an example of
ANSWER: A NATURAL SELECTION.
EXPLANATION:
When allele has direct effects on the organism and the environment, it is termed natural selection. It either affects an organism positively by causing more DNA reproduction, leading to the increase in allele’s frequency, or negatively by decreasing it .
However, this shouldn't be mistakened for genetic drift, where allele increase or decrease is established in the random organisms that survived.