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labwork [276]
3 years ago
9

Pleazz helpp.. why do you think holding your breath or breathing into a bag effects the pulse rate??

Biology
1 answer:
Mice21 [21]3 years ago
6 0
It's all dependent on the amount of oxygen your lungs take in and deliver to the heart
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Two heterozygous loonas are crossed. What proportion of the offspring will have black hair?
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(I'm guessing "loonas" does not mean black)

as you can see in the picture 25% is ll or black

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Evolution can be guided by random processes. What is the effect called when some genotypes are lost in a small population over t
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Genetic drift

Explanation:

Genetic drift is defined as the random change in allelic frequencies from one generation to the other.

Genetic drift is an evolutionary mechanism in which the allelic frequencies in a population change through many generations. Its effects are harder in a small-sized population, meaning that this effect is inversely proportional to the population size. Genetic drift results in some alleles loss, even those that are beneficial for the population, and the fixation of some other alleles by an increase in their frequencies. The final consequence is to <u>randomly</u> fixate one of the alleles. Low-frequency alleles are the most likely to be lost. Genetic drift results in a loss of genetic variability within a population.  

Genetic drift has important effects on a population when this last one reduces its size dramatically because of a disaster -bottleneck effect- or because of a population split -founder effect-.

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