postzygotic barrier

Examples of postzygotic barrier in the following topics:

• Reproductive Isolation

  • Scientists classify reproductive isolation in two groups: prezygotic barriers and postzygotic barriers.
  • A postzygotic barrier occurs after zygote formation; this includes organisms that don't survive the embryonic stage and those that are born sterile.
  • Some types of prezygotic barriers prevent reproduction entirely.
  • Other prezygotic barriers work when differences in their gamete cells prevent fertilization from taking place; this is called a gametic barrier.
  • When fertilization takes place and a zygote forms, postzygotic barriers can prevent reproduction.

• Barrier Islands

• Entry Barriers

  • One important source of oligopoly power are barriers to entry: obstacles that make it difficult to enter a given market.
  • One important source of oligopoly power is barriers to entry.
  • Barriers to entry are obstacles that make it difficult to enter a given market.
  • Additional sources of barriers to entry often result from government regulation favoring existing firms.
  • Explain the necessity of entry barriers for the existence of an oligopoly

• Economics

  • Trade barriers are government-induced restrictions on international trade.
  • Man-made trade barriers come in several forms, including:
  • Trade barriers are often criticized for the effect they have on the developing world.
  • International trade barriers can take many forms for any number of reasons.
  • Explain the different types of trade barriers and their economic effect

• Promoting Free Trade

  • Government can promote free trade by reducing tariffs, quotas, and non-tariff barriers.
  • In addition to tariffs and quotas, there are a number of other barriers to free trade that countries use.
  • Broadly, they are categorized as non-tariff barriers (NTBs).
  • NTBs act just like tariffs and quotas in that they are barriers to free trade.
  • Describe the effects of free trade and trade barriers on long run growth

• The Argument Against Barriers

  • Economists generally agree that trade barriers are detrimental and decrease overall economic efficiency.
  • Most trade barriers work on the same principle: the imposition of some sort of cost on trade that raises the price of the traded products.
  • If two or more nations repeatedly use trade barriers against each other, then a trade war results
  • Trade barriers are often criticized for the effect they have on the developing world.
  • Therefore, the ultimate economic cost of the trade barrier is not a transfer of well-being between sectors, but a permanent net loss to the whole economy arising from the barriers distortion toward the less efficient the use of the economy's scarce resources.

• Other Barriers

  • Barriers to trade include specific limitations to trade, customs procedures, governmental participation, and technical barriers to trade.
  • In addition to tariffs and quotas, other barriers to trade exist.
  • This category of trade barriers stems from regulations on international trade.
  • This category of trade barriers represents direct governmental involvement in international trade.
  • Technical barriers to trade are non-tariff barriers to trade that refer to standards implemented by countries.

• The Nature of Effective Communication

  • Physical barriers like distance, inferior technology, or staff shortages that reduce information processing capacity.
  • Attitudinal barriers presented by individuals.
  • Physiological barriers like ill health, poor eyesight, or hearing difficulties.
  • Communications have to take the potential barriers of an audience into account and tailor the message to reach them.
  • Define effective communication in the context of organizational challenges and barriers

• Technological Barriers

  • Standards-related trade measures, known in WTO parlance as technical barriers to trade play a critical role in shaping global trade.
  • As tariff barriers to industrial and agricultural trade have fallen, standards-related measures of this kind have emerged as a key concern.
  • But when standards-related measures are outdated, overly burdensome, discriminatory, or otherwise inappropriate, these measures can reduce competition, stifle innovation, and create unnecessary technical barriers to trade.
  • These standards-related trade measures, known in World Trade Organization (WTO) parlance as "technical barriers to trade," play a critical role in shaping the flow of global trade.
  • But standards-related measures that are non-transparent, discriminatory, or otherwise unwarranted can act as significant barriers to U.S. trade.

• Entry and Exit of Firms

  • In perfectly competitive markets, there are no barriers to entry or exit.
  • However, in most other types of markets barriers do exist.
  • Monopolies are often aided by barriers to entry.
  • Examples of barriers to entry include:
  • The factors that may form a barrier to exit include: