Answer:
Option B, Dd and Dd
Explanation:
It is given that deafness is a recessive trait.
Let the recessive trait be represented by "d"
Normal hearing is a dominant trait and let it be represented by "D"
It is given that Dr. Smith's parents have normal hearing , hence they can have genotype -
either Dd X DD
Or Dd X Dd
but Dr. Smith has an inherited form of deafness , thus his genotype would be "dd". Considering the genotype of Dr. Smith , his parents would be having genotype Dd and Dd.
Thus option B is correct.
The answer is B. Friction causes a loss of energy. The
pressure located within the arteries and arterioles fall when blood moves away
from the heart because the friction that is being produced when blood is moving
away from the heart causes a loss of energy, which makes the pressure fall.
Bacteria are the single-celled organisms can be edible as well as pathogenic.
Bacteria are the microorganisms that are omnipresent in nature. They can be mostly free-living organisms that can be useful as well as harmful for the living species. They can occur in a variety of shapes like spiral, coccus, vibrio, etc. Lactobacillus, Acetobacter aceti are the bacteria that are edible in nature.
Pathogenicity is the ability of an organism to infect another living organisms. They spread disease after the infection. This ability is present in a wide variety of organisms, both prokaryotic as well as eukaryotic. Viruses are considered to be the most notorious forms of pathogens.
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Answer:
the first wave of extinction may be related to rapid cooling at the end of the Ordovician Period, and the second phase is widely regarded as having been caused by the sea-level fall associated with the glaciation.
