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likoan [24]
3 years ago
15

Si se aparean especies diferentes como por ejemplo el cruce entre caballos y burros; podemos afirmar que si llegan a tener desce

ndencia esta va ser __________________________
Biology
1 answer:
White raven [17]3 years ago
7 0

Answer:

El híbrido va a ser esteril.

Explanation:

En la cruza entre dos especies distintas, cuando ocurre, existen distintos mecanismos de aislamiento reproductivo, que son barreras que inhiben o interrumpen el flujo génico entre especies distintas. Es decir que no habrá exito reproductivo de estas cruzas. 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 (Equus ferus caballus) y un burro (Equus africanus asinus). 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 puede producir gametas funcionales, por lo cual no puede reproducirse.  

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E) Nucleic acids; nucleotides; deoxyribose; ribose; uracil; thymine.

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5 0
3 years ago
Please help me!! 15 points!!!!!
Karolina [17]

Image 1.1 -

Stomata are little moth-like structures in leaves, that, when open, allow the exchange of gases between the plant and the exterior.

Answer:

B.

Image 1.2 -

Without the existance of stomata, the process of transpiration wouldn't be possible if there weren't structures thata allowed the exchange of gases.

Answer:

A.

Image 2 -

So, we can elminate plants because they can photosynthesise; bacteria because they are prokaryotes and can photosynthesise; archaea because they are prokaryotes; hat leaves us with animals and fungi because these cannot photosynthesise and are both eukaryotes.

But, we cannot skip information. It is also said that the organism found has a cell wall, and animals do not have cell walls.

Answer:

C.

Image 4 -

Option 1 = cilia

Option 2 = flagella

Option 3 = pseudopods

Option 4 = pili (they're a meant to attacht to surfaces only bacteria)

Image 5 -

Runner stems are those that grow horizontally, therefore the fourth image with the long horizontal stems.

Rhizome stems are underground stems that can form roots or shoots through their nodes. Therefore, the third image with white background (the one with 2 drawn plants).

Tuber stems are large underground (mostly) structures used as storages for the plant. Therefore, this corresponds to the first image (the one with the white background.

Bulb stems are short and "bulby" stems, whith thick, leaves. Therefore, the second image (the one with the grass background).

Hope it helped,

BioTeacher101

7 0
3 years ago
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