The correct statement is liver cells possess transcriptional activators that are different from those of lens cells.
<h3>What are Transcriptional activators?</h3>
Transcriptional activators are specific protein sequences capable of activating gene expression.
These transcription factors (transcriptional activators) act to regulate gene expression in target cells.
Transcriptional activators are factors that enable the expression of certain genes in particular cell types.
Learn more about Transcriptional activators here:
brainly.com/question/12150990
Answer:
There are not too many disadvantages of endoskeleton .
This is why most large animal around have them.
one large animal has one of the vunerability animals face without exoskeleton.
Explanation:
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Genotype of the Q gene is homozygous dominant
Answer:
Species separated by a physical barrier for a long time, suffer allopatric speciation, so they can not interbreed anymore.
Explanation:
Allopatric speciation consists of the geographic separation of a continuous genetic background giving place to two or more new geographically isolated populations. These separations might be due to migration, extinction of geographically intermediate populations, or geological events. In this speciation, some barriers impede genetic interchange, or genetic flow, as the two new populations that are separated can not get together and mate anymore. These barriers might be geographical or ecological.
Vicariance is the geographical separation of an original population into two or more new groups. Discontinuities in the physical environment like rivers, mountains, water, etc., are physical barriers that impede genetic flow between the separated groups.
The process of allopatric speciation involves different steps:
- The emergence of the barrier.
- Interruption in the genetic interchange
- The occurrence of new mutations and their accumulation in time in each population. Slow and gradual differentiation.
- Genetic divergence by natural selection and reproductive isolation makes it impossible for the two groups to mate even if the barrier disappears.
- Prezigotic isolation mechanisms favored by selection once occurs a secondary contact between the new species in formation.
