Blood first enters the heart's right atrium. A muscle contraction forces the blood through the tricuspid valve into the right ventricle. When the right ventricle contracts, blood is forced through the pulmonary semilunar valve into the pulmonary artery. Then it travels to the lungs
It is true, the bigger the diameter the slower the velocity of the impulse and myelin sheet helps the impulse travel in one direction.
Answer:
Allele for short tail is a dominant phenotype.
Explanation:
In the second generation , the cross between a group of short tailed mice produces either short tailed or long tailed species.
This means the short tailed mice must be having the allele for long tail trait but did not expressed it.
Hence, when two alleles are presents and one is expressed while the other is suppressed then allele expressing its trait would be the dominant phenotype.
Hence, the allele for short tail is a dominant phenotype.
Cross between two short tailed mice will be as follows
Ss * Ss
SS, Ss, Ss, ss
Out of four three are short tailed while one "ss" is long tailed.
