Answer:
Plants respond to environmental stimuli. Movement towards light, movement towards water, movement towards soft soil
Explanation:
Answer:
electrical impulse travels from the sinus node to the atrioventricular node across the cells of the heart left and right atria.
When the impulses get to the atrioventricular node which is located between atria and ventricles,it slow down for a short period of time
Explanation:
Heart excitation starts from the sinoatrial (SA) node then propagates through right and left atria. The atrial depolarization expands to the atrioventricular node, and move via the bundle of His to the bundle branches or Purkinje fibers.
electrical impulse travels from the sinus node to the atrioventricular node across the cells of the heart left and right atria.
When the impulses get to the atrioventricular node which is located between atria and ventricles,it slow down for a short period of time and it's then continue the conduction pathway through bundle of His into ventricles.
The correct answer is a series of distinctive anatomical traits that contrast with archaic traits from earlier hominins.
The study of human evolution focuses on the events which led to the development of the human species <em>Homo sapiens</em> as we know it now. The group of hominins includes the modern humans, extinct human species and our immediate ancestors. Earlier hominins possessed some characteristics which are distinctive from the modern humans.
Answer:
3:1
Explanation:
Let the allele for tall plant be T; &
The allele for short plant be t
When Mendel crossed true-breeding tall pea plants(i.e TT) with true-breeding short pea plants(I.e tt); all the offspring were tall.
TT × tt
T T
t Tt Tt
t Tt Tt
we can deduce from the punnet square that the F1 offspring are all heterozygous tall plant.
Now, if the first generation (F1) tall plants are allowed to self-pollinate; we have a cross between Tt and Tt
TT × tt
T t
T TT Tt
t Tt tt
We can see phenotypically that we have 3 tall plant(TT,Tt, Tt) and 1 short plant(tt).
Therefore the ratio of phenotypes he expected in the F2 generation is (3:1)