neurons are specialized cells that generate and conduct electrical impulses throughout the body.
Jonas Salk and Albert Sabin in 1950s developed. separate vaccines. one from killed viruses. and other from live viruses to combat the dreaded disease polio. Salk became a national hero when he allayed the fear of polio with his vaccine, approved in 1955
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Answer:
Steven has heterozygous genotype.
Explanation:
Tongue rolling is a dominant trait, that means the trait can express itself at the homozygous dominant and as well as in the heterozygous condition. The recessive homozygous condition is not able to express this trait.
Steven can roll his trait, this means his genotype is either homozygous dominant or heterozygous. The wife is recessive for the trait. Their son cannot roll his tongue, this means the Steven is heterozygous dominant. If the Steven is homozygous dominant his son will be able to express the trait.
Thus, the answer is Steven has heterozygous genotype.
It is imply to cold in the North for tropical plants to grow. A tropical plant needs constant warmth, but the Northern United States has fluctuations between extreme cold and extreme heat.