Answer: After seven months.
Explanation:
The blood carries various substances that must be transported from one part of the body to another. Red blood cells are an important component of the blood because their function is to carry oxygen to the body tissues and exchange it for carbon dioxide, which is carried and removed by the lungs.
Erythropoiesis is the process of red blood cell (erythrocyte) production. It is stimulated by a decrease in O2 in the circulation, detected by the kidneys, which then secretes the hormone erythropoietin. This hormone stimulates the proliferation and differentiation of red blood cell precursors, which triggers an increase in erythropoiesis in hematopoietic tissues and ultimately in the production of red blood cells. <u>In adults, red blood cells are formed in the red bone marrow.</u>
In early developing fetuses, erythropoiesis occurs in the mesodermal cells of the yolk sac. In the third or fourth month, erythropoiesis moves to the liver. After seven months, erythropoiesis occurs in the bone marrow.
Answer:
Women have wide hips or big hips in order to be prepared for the childbirth and permitting pregnancy. The size of the hips of the women starts to wide during puberty as hips bone widens due to the estrogen that leads to increase in size of pelvis.
Advantages of big hips in women:
Besides the sexual attraction widen or big hips are the essential for the physical support and helps in conceiving pregnancy and permitting childbirth. It is also helps in advantage of store fat.
There are not enough significant disadvantages of wide hips other than physical and sexual challenges.
. In mitosis the nuclear membrane breaks down and the centrosome
C is correct.
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Answer:
Each granddaughter cell is haploid (n)
Explanation:
Meiosis in the parent cell with a "2n" chromosome number would produce a total of four daughter cells. Each of these daughter cells would have an "n" number of chromosomes as separation of homologous chromosomes to the opposite poles during anaphase-I reduces the chromosome number to half in the daughter cells. Also, the event of crossing over and random segregation of homologous chromosomes makes the daughter cells of meiosis genetically different from each other.
Each of these four cells enters mitosis and forms a total of eight cells. Since mitosis maintains the chromosome number, each of the eight cells would have an "n" number of chromosomes and would be haploid.
