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Elodia [21]
3 years ago
6

What stimulates the pollen tube to grow ​

Biology
1 answer:
ASHA 777 [7]3 years ago
4 0

Synergids stimulates the pollen tube to grow.

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Fill in the with what each type of organic compound is made up of.
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Carbohydrates: glucose (monosaccharides)
Lipids: fatty acids
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3 years ago
Read 2 more answers
In an experiment, the group that is exposed to the factor being tested
zaharov [31]
The grp being tested is the experimental group
the grp tht is not being tested is the control grp
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3 years ago
A small group of diploid triangular Sticky Notes were fluttering along the coast of The Mainland. A storm blew in and blew the S
muminat

Answer:

Because genetic drift (Founder effect) is acting on this population. Not all the Hardy weinberg criteria are accomplished. There are no random matings and populations are finite-sized.

Explanation:

This is a special case of genetic drift: the founder effect.

The “Founder effect” phenomenon refers to cases where a new population originates from a few founder individuals, coming from a bigger ancestral population, that established in a new environment. This small population might or might not be genetically representative of the original one. This subgroup carries with them some genetic information that they share with their original population. Over time, some genes can be lost, or they can increase in frequency. Some rare alleles might be exceeded or might be completely lost. On Consequence, when the small population grows, it will have a genetically different composition from the original one. In these situations, genetic variability is reduced and enhances the possibility of developing a peculiar allelic composition. In some cases, the founder effect is part of the process of speciation.  

The criteria for maintaining a Hardy-Weinberg equilibrium are:  

  • Random matings
  • No superposed generations
  • No mutations
  • No migration  
  • Infinite population size
  • No natural selection

Genetic drift involved the un-accomplishment of random matings and infinite population sizes.

Genetic drift involves:

  • limited population sizes
  • individuals reproduce by endogamy/exogamy, and matings occur by phenotype.

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3 years ago
Mid-ocean ridges are segmented and contain which two basic types of plate boundaries linked together?
mamaluj [8]
Mid ocean ridges occur where two tectonic plates diverge or move away from each other. This separation occurs under the ocean.The Mid-Atlantic Ridge is such an example and is where the North and South American plates pull away from the Eurasian and African plates. Mid ocean ridges are usually a combination of divergent and transform plate boundaries. At transform boundaries plates slide past each other in opposite directions. 
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4 years ago
Why do vertebrate embryos show similarities between organisms that do not appear in the adults?
yKpoI14uk [10]

It is believed that this happens because some signals that regulate development are the same between different species and because <span>they share ancient genes. </span>These ancient genes are expressed during a middle "phylotypic stage" of embryonic development for all species.

For example,  human and animal embryos go through very similar stages of early development and share similar features such as tails and gill-like structures. The major difference appears to be how long it takes to reach each of these same stages.

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