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
Marizza181 [45]
3 years ago
8

With the severe changes to natural environments, many species are coming into contact with other species from which they were on

ce separated, and sometimes members of the different species mate and produce hybrid offspring. One example of this is the pizzly bear, a cross between a polar bear and a grizzly bear. One concern from such hybridizations is that the hybrids tend to not survive long enough to reach reproductive age, many not even completing development. What isolating mechanism is being described here?
Biology
1 answer:
Artist 52 [7]3 years ago
6 0

Answer:

Postzygotic isolating mechanism

Explanation:

Reproductive isolation can occur due to prezygotic or postzygotic isolating mechanism. Prezygotic mechanism prevents fertilization of gametes and can occur due to different mating behavior, different mating time period etc. Postzygotic mechanism occurs after the formation of zygote i.e. the organisms are able to mate and fertilization also occurs. However the resultant zygote may not survive. It might not survive immediately or might die before reaching the reproductive maturity. Such a situation would still come under reproductive isolation because the resultant offspring is not viable and not able to pass on the genes to the next generation.

You might be interested in
In prokaryotes, functionally related genes are usually clustered in a single operon. what has been found to be the case in eukar
Andre45 [30]
Genes in eukaryotes are dispersed and not clustered onto a single operon
5 0
2 years ago
Which statement best explains the impact of favorable oceanic conditions on the Geosphere?
GREYUIT [131]

Answer:

The best answer is "Ocean waves add more sand to beaches"

Explanation:

based on statement above, the oceanic conditions are changes in ocean parameters (temperature and movement) and substances which contain in oceans (salinity, nutrient availability, oxygen and carbon dioxide level, etc).

Geosphere is a part of the earth that included the earth's interior, landform, rocks, and mineral. There are lithosphere, atmosphere, hydrosphere, biosphere and, anthroposphere.

on the answer choice, the ocean wave is the example of the oceanic condition which has changed in movement. and the beach is an example of the lithosphere.

3 0
3 years ago
What organelle processes and sorts proteins to be shipped
Rashid [163]

Answer: The Golgi apparatus

Explanation: The Golgi apparatus modifies, sorts, and packages different substances for secretion out of the cell, or for use within the cell.

3 0
2 years ago
How is it possible for one twin to get skin cancer but the other one doesn´t
tia_tia [17]

Looking at most newborn twins squirm contentedly in their cribs, you'd never guess that some were recently in peril. That's because carrying multiples raises the risks that a woman can suffer complications before she actually delivers.

Many twins are miscarried early in the pregnancy, often before a woman even knows she's pregnant. As reported in the International Journal of Fertility, only about one in eight embryos that starts as a twin is born as a twin. If they do survive, twins are usually born healthy. However, they are still more likely than other babies to have birth defects or to be born prematurely or underweight.

Carrying twins can be hard on you, too. You'll be more likely to develop pregnancy-related high blood pressure or diabetes. And there's a greater likelihood you will have a cesarean section when you deliver.

If you're carrying twins, some simple lifestyle changes and good prenatal care may help you reduce the likelihood of the following complications.

Low birth weight

Because they have to share nutrients and living space, newborn twins tend to be smaller than single babies. Even full-term twins often weigh less than 5-1/2 pounds each, making them vulnerable to a variety of health problems. You can help your babies reach a healthy size by making sure you put on enough weight during pregnancy. Try to eat 300 calories more each day than you would if you had a single baby (about 2,700 calories in total). If you had a healthy weight before pregnancy, you should aim to put on about 35 or 45 pounds.

Unequal size

Twins don't always share equally. In roughly 30 percent all twin births, one baby will be larger than the other. Some studies suggest that if one of your babies is at least 25 percent heavier than the other, one or both of them may be more likely to have breathing problems or need intensive care. Your doctor will track the growth of both your babies throughout your pregnancy. The first signs of unequal growth usually appear in the third trimester.

Twin transfusion syndrome

Twin transfusion syndrome poses a dangerous threat to identical twins who share a single placenta. It's normal for such twins to exchange blood during a pregnancy. But in about 20 percent of cases, one twin starts pumping large amounts of blood to the other twin, putting both of them at risk. In severe cases, the twin receiving the extra blood may develop heart failure while the other twin becomes dangerously anemic. Early diagnosis and treatment can slow the abnormal blood flow and lower the risk of complications.

Birth defects

Birth defects are common in twins, especially identical twins. Taking folic acid before and during pregnancy can help prevent neural tube defects. As reported in the medical journal The Lancet, however, about 10 percent of all identical twins are born with a birth defect such as a heart problem, a shortened limb, a club foot, or a dislocated hip (the conditions listed are linked to having less space in the uterus and would not be affected by folic acid.) Most of these conditions are treatable, however.

Risks to the mother

Your doctor will check you regularly throughout the pregnancy for signs of high blood pressure or diabetes. When detected early, both of these conditions can be controlled before they have a chance to threaten your pregnancy.

Special care

Carrying twins means you'll probably get extra attention from your doctor throughout your pregnancy. The doctor may suggest cutting back on activities between the 20th and 30th week of pregnancy, even if you haven't had any signs of labor. Many physicians also recommend an extra monitoring check on the babies' heart rate and movement, such as an ultrasound or nonstress test. A biophysical profile, which checks on heart rate, movement, and the amount of amniotic fluid in your body, might also be indicated. If you do go into labor prematurely, your doctor may suggest drugs to stop the labor or use corticosteroids to speed up the development of the babies' lungs.

It's possible that you may be able to deliver twins vaginally. But if the labor is difficult, the birth canal is too narrow, or one or both of the infants is in the breech position, you may have to undergo a c-section, in which the babies are delivered through an incision in your uterus. Talk to your doctor about what you can do to prepare for delivery.

Twins are a special challenge, both before birth and after. For now, your job is to stay healthy and get top-quality prenatal care. Two important people are counting on you.

Does this help lol :D

4 0
2 years ago
Read 2 more answers
Animals that feed primarily or exclusively on plants and algae are classified as _______. see section 30.3 (page 624) .
Hoochie [10]
<span>herbivores is the answer

</span>
7 0
3 years ago
Other questions:
  • The sensory division of the body
    15·1 answer
  • compare the thickness of the wall of the superior and inferior vena cava and the aorta. which is thicker and why???
    14·1 answer
  • Processes on and near Earth's surface produce _____ rocks. A. Metamorphic B. Sedimentary C. Igneous
    12·1 answer
  • PLEASE PLEASE HELP ME!!!! (10 POINTS!)
    11·1 answer
  • Which statements describe asexual reproduction? Check all that apply
    13·1 answer
  • Gan
    7·1 answer
  • Mariyam, a marine biologist, measures the length of a great white shark at 4.5 m long and its teeth at an average of 50 mm long.
    13·2 answers
  • A group of scientists has recently created a strawberry with a new mutation. This mutation causes the strawberry plant to produc
    9·1 answer
  • What are Carotenoids?
    7·2 answers
  • Why is the permeability of
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!