Ce Bio 2011 Ii Q49 __hot__

This question is frequently cited in past paper review documents and marking schemes because it highlights a common student misconception: the "gambler's fallacy." Many students incorrectly believe that if the first child is albino, the second child is "less likely" or "more likely" to be albino to "balance the odds." In genetics, each fertilization event is independent.

The ratio is 1:1, meaning there is a for each subsequent child to be albino. Educational Significance

(a) Determine the genotypes of I-1, I-2, II-3, and II-4. (b) If II-3 marries a normal male (no traits), what is the probability that their first son has ? (c) Explain why Trait B is never passed from father to son. ce bio 2011 ii q49

The 2011 CE Biology examination, particularly Section II Question 49, typically assessed candidates’ understanding of a cornerstone of human physiology: . While the question likely presented a diagram of the nephron or a graph showing changes in blood plasma composition, the underlying theme is the kidney’s role in maintaining a stable internal environment. This essay will explore the biological principles relevant to that question, including negative feedback control, selective reabsorption, and the action of antidiuretic hormone (ADH).

Given the ambiguity,

– that seems trivial. If the question intended a non-zero probability, the father would have Trait A. Perhaps the original Q49 used autosomal recessive for Trait A? Let me adjust.

The plasmid serves as a vector , carrying the foreign gene into the bacteria. This question is frequently cited in past paper

Calculating the probability that their second child will also be albino. Scientific Analysis & Explanation

The functional unit of the kidney is the nephron. The loop of Henle establishes a salt concentration gradient in the medulla, allowing the collecting duct to reabsorb water. ADH increases the permeability of the collecting duct walls by inserting aquaporin channels. Consequently, more water is reabsorbed back into the bloodstream, producing a smaller volume of concentrated urine. This restores blood water potential to normal—a classic negative feedback mechanism. A question from 2011 may have asked students to predict the effect of ADH deficiency (diabetes insipidus) or to label where ADH acts on a nephron diagram. (b) If II-3 marries a normal male (no