<h2>Membrane potential </h2>
Explanation:
- Membrane potential represents charge difference across the membrane, all biological cells are negative inside (cytoplasm) and positive outside (due to difference in ionic distribution)
- In a typical neuron cell membrane potential of cytoplasm is negative at rest (when no stimulus is applied) hence called resting membrane potential
- Resting membrane potential of excitable cells is established by Na+ and K+pump
- Repolarization starts with the efflux of K+ by the opening of voltage gated K+ channels
- Voltage gated K+ channels starts to open when voltage gated Na+ channels becomes inactive
- Hyperpolarization occurs due to excessive efflux of K+ by voltage gated K+ channels
- Additional efflux of K+ occurs due to slow inactivation of voltage gated K+ channels
Three weeks is how long a human can live without food
The first one; a disturbance that transfers energy from one place to another
Answer:
0.25%
Explanation:
20 people start the new population. So there are 20 genes or 40 alleles for the recessive disorder phenylketonuria. 2 out of 40 alleles are recessive for the condition hence frequency of the allele = 2/40 = 0.05
Frequency of the allele does not change when the population increases so it is in Hardy-Weinberg equilibrium. According to it, if q is the frequency of recessive allele, q² = frequency of the recessive condition
Here, q = 0.05 So,
q² = (0.05)² = 0.0025
In percentage, it is 100 * 0.0025 = 0.25%
Hence, incidence of phenylketonuria in the new population is 0.25%
Answer:
The correct answer is innate behavior.
Explanation:
The behavior that gets monitored by genes and goes through the process of natural selection is termed as an innate behavior. This form of behavior takes place naturally and it just requires a specific kind of stimulus in order to get initiate. Instinctive behavior is the other term for innate behavior.
The tendency of an animal to perform a specific behavior after getting exposed to the stimulus for the first time is known as instinct. It can be said that one cannot learn innate or instinct behavior. It is performed by all the species in a similar manner irrespective of the surroundings. Caring for offspring is one of the examples of innate behaviors performed by the species that even demonstrate the basic life functions. Innate behaviors play an essential role in transmitting or passing genes to the coming generations.
