Individual
members of the same species are genetically very different because of a process
called meiosis which creates gametes.
<span>During
the meiosis (prophase I) the process called crossing over occurs. Crossing-over
represents the exchange of genetic material between non-sister chromatids of
homologous chromosomes which results in new combinations of genes on each
chromosome (genetic variation).</span>
Rickets develops in growing children who are not exposed to sunlight and have a deficiency of vitamin D, phosphorus or calcium. The disease leads to symptoms such as softening/weakening of the bones, muscle weakness and delayed formation of teeth. The disease is most often observed in young children that are aged between 6 to 24 months of age.
Answer;
A bottleneck effect
Explanation;
When only a few individuals survive unfavorable times, thereby losing the majority of genotypes in the next generation, it is called a bottleneck effect.
It occurs when there is a disaster of some sort that reduces a population to a small handful, which rarely represents the actual genetic makeup of the initial population.
Answer:
The melanocytes: these produce melanin, the pigment that provides the skin with its color and protects it from the sun's rays.
The keratinocytes: these form epidermal keratin.
Explanation:
