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
Andreas93 [3]
3 years ago
9

Rocky mountain juniper (juniperus scopulorum) and one-seeded juniper (j. monosperma) have overlapping ranges. pollen grains (whi

ch contain sperm nuclei) from one species are unable to germinate and make pollen tubes to bring the sperm nuclei to the female ovules (which contain egg cells) of the other species. these two juniper species are kept separate by ________.
Biology
2 answers:
bixtya [17]3 years ago
8 0

Answer:

Mechanical isolation

Explanation:

mechanical isolation is a form of prezygotic reproductive barrier, whereby similar species organisms become isolated and unable to successfully interbreed with each other to form zygote, as a result of incompatibility of their reproductive organ or structure, which prevents them from copulating. As a result of this, both species become separated as there is no gene flow between both.

The two species of juniper can be said to be kept separate by <em>mechanical isolation</em>, due to the differences and incompatibility of their reproductive structure.

Elis [28]3 years ago
4 0

Mechanical isolation

Mechanical isolation occurs when two organisms of the same species are unable to copulate because of the differences in their reproductive organs. In flowering plants, differences in the structure of the reproductive parts may also hinder pollination. From the question given above, even though the two plants have overlapping ranges, the pollen grains from one species are unable to grow thus disallowing the pollen tubes to connect or transport the sperm nuclei to the female ovules of the other species where the fertilization of the eggs will occur. These two species are said to be isolated mechanically.

 







You might be interested in
Below are a list of crosses and a list of progeny phenotypic ratios. Match each cross with the expected progeny phenotypic ratio
alina1380 [7]

Answer:

sorry

Explanation:

7 0
3 years ago
• How is a cell's specialized shape related to its specialized function?<br> CELL PARTS:
VashaNatasha [74]

Answer:

Cells vary greatly in shape These shapes are often related to the function they perform. like the disk shape of  erythrocytes  can absorb and transport oxygen due to increased surface area., the amoeboid shape of leukocytes allow them to squeeze through capillaries. etc.

Explanation:

Cells can be disc-like , polygonal, rectangular, cubopid thread like branched or even irregular. these are related to the functions that each cell performs.

Some examples showing relation between cell shape and function are as follows.:

  • Human blood cells are circular and biconcave to transport oxygen.
  • White blood cell are amoeboid to squeeze through thin capillaries.
  • Nerve cells are long so that they can carry nerve impulse to a long distance very quickly.
  • Guard cells of stomata are bean or dumbell shaped to open and close the stomata.
4 0
3 years ago
What type of medical direction do standing orders and protocols describe?
MrRa [10]

offline medical direction

It is also called "Indirect" medical direction.

It is issued by Med Director allowing EMTs to give particular medication and perform certain procedures without speaking to another physician.  It is a type of medical oversight  where control include emergency care improvements.

3 0
3 years ago
HELP ASAP PLEASE!!!
Leya [2.2K]

3. It produces RNA strands

3 0
3 years ago
You see a white marker with an orange circle and black lettering. what does this marker tell you
AlexFokin [52]

Answer:

Controlled area

Explanation:

  • A white marker with an orange circle and black lettering indicate a controlled area which may represent a speed limit, wake restrictions or anchoring.
  • These markers are regulatory markers that are present to make the boaters aware of the dangers and their surroundings.
  • These markers help in navigation.
6 0
3 years ago
Other questions:
  • The riskiest sexual activity for contracting hiv is
    7·1 answer
  • A population of water snakes is found on an island in Lake Erie. Some of the snakes are banded and some are unbanded; banding is
    11·1 answer
  • What do two different neutral isotopes of the same element have in common?
    15·2 answers
  • Dichotomous keys ask open-ended questions about animal behavior. open-ended questions about easily observable characteristics. y
    15·1 answer
  • , what location on Earth is receiving the most hours of sunlight? Why?
    14·2 answers
  • Biologists often determine population density by capturing animals and marking them for later identification upon recapture. A b
    11·1 answer
  • A group of organ systems that work together to perform a common function
    10·1 answer
  • I am both unicellular and multicellular depending on how old I am. When I am getting ready to reproduce, my cells join together
    15·1 answer
  • What property of water is responsible for water transport in plants
    7·1 answer
  • What term describes a new community replacing an existing community?
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!