In rabbits, albinism (white fur and pink eyes) represented by 'a' is recessive to black fur colour and black…

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In rabbits, albinism (white fur and pink eyes) represented by 'a' is recessive to black fur colour and black eyes represented by 'A'. An albino male is crossed with a pure breeding black female. What is the probability of producing a normal F1 offspring?

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43. Two sets of apparatus were used to investigate the process of photosynthesis. Before the set ups were exposed to sunlight, both plants were kept in the dark for 48 hours. What colour change is observed when iodine is used to test for starch in the leaves?

A Orange. (Keeping plants in the dark for 48 hours destarches them. Iodine solution tests for starch, turning blue-black in its presence. If no starch is present, the iodine solution retains its original yellowish-brown or orange color.)

44. In an investigation of the effects of external factors on body temperature of various animals, the following results were shown graphically. From the graph above, the rat is described as:

D A poikilothermic animal. (The graph shows that the animal's body temperature varies directly with the external temperature. A poikilothermic animal is one whose body temperature fluctuates with its environment.)

45. The table below shows the composition of four different food. Which food will best prevent anaemia?

B P. (Anaemia is often caused by iron deficiency. Food P has the highest iron content at 1.5 mg, making it the best choice to prevent anaemia.)

46. In rabbits, albinism (white fur and pink eyes) represented by 'a' is recessive to black fur colour and black eyes represented by 'A'. An albino male is crossed with a pure breeding black female. What is the probability of producing a normal F₂ offspring?

Determine the genotypes of the parent generation (P).
Albino male = aa
Pure breeding black female = AA
Determine the genotypes of the first filial generation (F₁).
Crossing aa $\times$ AA produces all Aa offspring. All F₁ offspring are heterozygous black (normal phenotype).
Determine the genotypes and phenotypes of the second filial generation (F₂).
Crossing F₁ offspring (Aa $\times$ Aa):
$\begin{array}{|c|c|c|} \hline & \text{A} & \text{a} \\ \hline \text{A} & \text{AA} & \text{Aa} \\ \hline \text{a} & \text{Aa} & \text{aa} \\ \hline \end{array}$
The F₂ genotypes are 1 AA : 2 Aa : 1 aa.
The F₂ phenotypes are 3 black (normal) : 1 albino.
Calculate the probability of producing a normal F₂ offspring.
Normal offspring are those with genotypes AA or Aa. There are 3 such outcomes out of 4 total possible outcomes.
Probability = $\frac{3}{4}$ .
- C $\frac{3}{4}$ .
47. A fish suffocates and dies if taken out of water. This is due to the fact that:
- B Gills stick to each other. (When a fish is out of water, the delicate gill filaments collapse and stick together due to surface tension, drastically reducing the surface area available for gas exchange and preventing efficient oxygen uptake from the air.)
48. The graph below shows the effect of temperature on the rate of photosynthesis. What is the significance of point X on the graph?
- B Maximum rate of photosynthesis. (Point X represents the peak of the curve, indicating the optimum temperature at which the rate of photosynthesis is highest before it starts to decline due to enzyme denaturation at higher temperatures.)
49. From the table above, which Blood group is a universal donor?
- D Blood group O. (A universal donor can donate blood to all other blood groups. According to the table, Blood Group O is compatible with recipients A, B, AB, and O, indicated by 'X' in all recipient rows for Donor Blood Group O.)
50. The table below shows the predator/prey relationship over a five (5) year period. Why does the population of predators drop by the fifth year?
- C Lack of enough prey to feed on. (The table shows a significant decline in the prey population from year 3 (300) to year 4 (100) and year 5 (30). This drastic reduction in the food source for predators would lead to a corresponding drop in the predator population due to starvation.)

In rabbits, albinism (white fur and pink eyes) represented by 'a' is recessive to black fur colour and black eyes represented by 'A'. An albino male is crossed with a pure breeding black female. What is the probability of producing a normal F1 offspring?

Step-by-step solution

Determine the genotypes of the parent generation (P).

Determine the genotypes of the first filial generation (F₁).

Determine the genotypes and phenotypes of the second filial generation (F₂).

Calculate the probability of producing a normal F₂ offspring.

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