Evolutionary biologists theorize that
the first living organisms on earth are single-celled prokaryotes. The two
prokaryotic domains are archaea and bacteria. Bacteria varies from
disease-causing pathogens to valuable photo synthesizers and symbionts while archaea
are diverse, but not pathogenic and they have the characteristics to live in
extreme environments. Moreover, the presence of prokaryotes is highly
dominating for they can be found everywhere even inside our bodies but they are
difficult to count, classify or detect.
Answer:
I think it's <em>Primary Environment</em> .
Explanation:
hope u liked the answer :)
Both parents are normal. But, some of the kids have the disease. This indicates that the parents are heterozygous for the disease (let's use Dd). They are phenotypically fine because D is normal. But we know they must both carry the diseased d allele because their kids have the disease.
If you cross Dd x Dd you get DD, Dd, Dd and dd as the possible outcomes. But because each time they have a child they roll the dice as to which of the 4 above happens, they were unlucky as 3 of those times they got dd for their child...so 3 of them have the disease (and are dd). One is phenotypically normal but could still be Dd or DD.