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nikdorinn [45]
3 years ago
6

Que tipo de aislamiento reproductivo exhibe la mula?

Biology
1 answer:
bulgar [2K]3 years ago
4 0

Answer:

<em>Aislamiento postreproductivo: Esterilidad del híbrido</em>

Explanation:

El concepto biológico de <u>especie</u>, en su definición, destaca que los ejemplares de una especie no pueden entrecruzarse con ejemplares de otra especie distinta, o bien, en caso de hacerlo, no hay éxito reproductivo.

Existen distintos mecanismos de aislamiento reproductivo, que son barreras que inhiben o interrumpen el flujo génico entre especies distintas. Se trata de caracteres biológicos propios de cada especie que previenen la reproducción con otras especies.

Estos mecanismos de aislamiento reproductivo pueden ser precigóticos o postcigóticos.  

  1. Pre-copulatorios o pre-cigóticos:
  • Ecológico o por aislamiento de hábitat;
  • Estacional o temporal;
  • Sexual o etológico;
  • Mecánico;
  • Por incompatibilidad de gametas.  

   2. Post-copulatorios o cigóticos:

  • Inviabilidad del híbrido;
  • Esterilidad del híbrido;
  • Híbrido con viabilidad o fertilidad disminuido;
  • Interacciones citoplasmáticas.

La mula es producto de la cruza entre dos especies distintas: una yegua (<em>Equus ferus caballus</em>) y un burro (<em>Equus africanus asinus</em>). Es un ejemplo de la accion de mecanismo poscigótico, en el cual se forma un híbrido viable esteril. Este ejemplar puede nacer crecer y sobrevivir, pero que no pueden producir gametas funcionales, por lo cual no pueden reproducirse.        

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Give two similarities and two differences between gymnosperms and angiosperms.
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<span>·         </span>Having seed-Gymnospermes and Angiospermes are types of plants bear seeds. They belong to a single class known as Spermatophyta. Spermatophyta or seed plants are those <span>plants that produce seeds.</span>

<span>·         </span>Diferentiation- The sporophyte (diploid multicellular stage in the life cycle of a plant) of both,<span> Gymnospermes and Angiospermes,</span> is differentiated into root, stem, and leaves.


Differences between Gymnospermes and Angiospermes:

 

<span>·         </span>Seed-Although both have seeds, differences between them are huge. Gymnospermes have bare, non-encased seeds. The term "gymnosperm"  in Greek means "naked seeds". On the other hand, seeds of Angiospermes are enclosed within an ovary, usually in a fruit.

<span>·         </span>Pollination- In Gymnospermes, the pollination is by wind, unlike most Angiosperms, who use insects, mammals or birds.  Gymnosperm flowers are often difficult to spot because they are not out to attract flying pollinators.

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lipids

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The purpose of the replication bubble is that it forms where replication is taking place (option A).

<h3>What is replication?</h3>

Replication is the process of producing replicas or duplicate of DNA or RNA molecules.

DNA replication is a very important process that occurs prior to cell division. During replication, the double stranded DNA is separated into two single strands.

Each copy called the leading and lagging strand becomes the template for the synthesis of new DNA strands.

However, a structure called replication bubble is a formed during the separation of two DNA strands by the helicase enzymes.

Therefore, the purpose of the replication bubble is that it forms where replication is taking place.

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