Answer:
1) the genes and chromosomes do not double after each generations because parental sex cells are haploid and only contain one set of chromosomes. During fertilization the two cells fuse to form a diploid zygote with two copies of genes and chromosomes. For example a normal human has 46 chromosomes (2 copies of 23 chromosomes) during reproduction gametes which contain 23 chromosomes (haploid) fuse to form an offspring with the correct number of chromosomes ( 23 + 23 = 46).
2) offspring only receive one set of chromosomes from each parent so to maintain the chromosome number of humans. If this did not happen you would not be the same species.
There is also evidence that they may not have the same capacity to multiply as embryonic stem cells do. Hope this helps :)
Answer:
Fungi are the eukaryotic, multicellular and heterotrophic organisms that are different from plant and animals.
The body of fungi consists of mycelium, fruiting body and spore. Mycelium is composed of threads like structure called hyphae. Fruiting body of fungi is the place where spore are produced. Spores are the reproductive elements of fungi through which new fungi is produced.
Answer:
What do you mean dichotomous key? and how many do you have to put down?
Explanation:
Answer:
the electrical impulses get sent through the conduction pathways which cause ventricles to contract and this allows heart to pump blood.
Explanation:
The electrical impulse starts in a small bundle of specialized cells located in the right atrium, called the SA node. The electrical activity spreads through the walls of the atria and causes them to contract. This forces blood into the ventricles.
And it should be understood that, an electrical stimulus is generated by the sinus node (also called the sinoatrial node, or SA node). The electrical stimulus travels down through the conduction pathways and causes the heart's ventricles to contract and pump out blood.
