D) genes and environment is the answer
Monosomies is the point at which one chromosome does not have its homolog which is uncommon. Monosomies happen in cells From slip-ups in cell division amid mitosis and are related to compound presentation and cancers.Once preparation happens the gamete with 22 chromosomes shapes a zygote with 45 chromosomes. Most don't survive the just a single known to survive is monosomy 21 which resembles down disorder and causes many birth deformities and they don't survive long.
Answer:1) medulla to the diaphragm, increasing the rate of breathing
Explanation:
Basically involuntary respiration is controlled by the Respiration centers in the brain Stem. They are group of respiratory neurons ; the dorsal and ventral respiratory groups located in the medulla oblongata , and the pontine respiratory group located in the Pons varolii.
The primary function of this center is for creation and maintenance of respiration rhythms and adjustment of the sequences to fluctuation in body homeostatic balance .
In order to regulate respiration rate and its depth, it collects its input signals from chemoreceptors ( cells that generate biological signals from chemical substances), mechanoreceptors( receptors which relay external physical stimuli of touch, and pressure to internal stimulus by regulation of gated ion channels), the hypothalamus and the cerebral cortex. The fluctuation in the levels of plasma C02, oxygen, and blood pH, stimulated the input progression.
Therefore an elevated C02 blood levels, marked by low pH send input signals to the respiratory centers in the medulla.The latter sends signals to the respiratory muscles (and the diaphragm,) to initiate mechanism of rapid breathing to exhaled more C02 so that the acidity of the blood is reduced..
Answer:
formation of organ systems
Explanation:
Actually, answer might be formation of organ systems b/c fetus are unborn offspring that have organ systems in place. Thus to develop a fetus the zygote has to multiply and eventually form organ systems (around 8 weeks from conception).
