Children's steady growth, brain maturation and intellectual advances help in making the middle childhood a time for more independence.
The middle childhood ranges from six to twelve years of age and is a very important phase for the growth and development of a child. It is in this stage of life that a child gains social, cognitive, emotional and physical advancements. The middle childhood basically lays the foundation for adulthood. The brain maturation in this phase involves the growth of certain structures like the frontal lobe which enhances learning and decision making. Steady growth and all the intellectual advancements aid in generating a sense of autonomy and independence in children. This helps in refining the child's capabilities.
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Twin Studies-genetic-the answer is true, according to quizlet -> The rationale for twin studies is that both identical and fraternal twins normally develop under similar environmental conditions. However, identical twins share more genetic kinship than fraternal twins. So if pairs of identical twins are more similar in intelligence than fraternal twins, it's presumably because of their greater genetic similarity.
And these studies do show that on average, identical twins are more similar than fraternal twins.
Answer: B) the presence of inherited antigens on the surfaces of erythrocytes.
Explanation:
A blood group is a classification of the blood according to the characteristics present on the surface of the red blood cells called erythrocytes. The two most important classifications for describing blood groups in humans are antigens (the AB0 system) and the Rh factor.
The AB0 system was discovered in 1901, and was the first known blood grouping system; its name comes from the <u>three types of groups that are identified: antigen A, antigen B, and 0 (zero) without antigens.</u>
<u>Each individual has a different set of erythrocyte antigens</u>, and because of their number -there are currently 32 known antigenic systems, plus some differentiated antigens that have not yet been attributed to any specific system- it is difficult to find two individuals with the same antigenic composition. Different antigenic systems are characterized by inducing antibody formation at different intensities; therefore some are more common and others are more rare. <u>So, the antigenic systems considered most important are the AB0 system and the RH system</u>.
Characteristics of the AB0 system are:
- People with type A blood: their red blood cells express type A antigens on their surface and develop antibodies to the B antigens in the plasma.
- People with type B blood: their red blood cells express type B antigens on their surface and develop antibodies to the B antigens in the plasma.
- Persons with type 0 blood: they have no such antigens (A or B) on the surface of their red blood cells, but develop antibodies to both types.
- Persons with type AB blood: having both antigens on the surface of their red blood cells, they do not make any antibodies to the A or B antigen.
The Rh system is the second blood group system in human blood transfusion with 50 antigens currently. In 1940, another group of antigens was discovered and they were called Rhesus factors (Rh factors). People with rhesus factors in their blood are classified as "Rh positive", while those without the factors are classified as "Rh negative". It is common for D-negative individuals to have no anti-D IgG (immunoglobulin-G) or IgM antibodies, since anti-D antibodies are not normally produced by sensitization to environmental substances. Rh-negative people form antibodies to the Rh factor, if they are exposed to Rh-positive blood.
5 is d and 6 is d.
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