IGCSE Biology Paper-3: Specimen Questions with Answers 276 - 277 of 358

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Question 276

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Using a suitably labelled genetic diagram, explain how a baby can have blood group O (IOIO) when its mother is group A and its father is group B.

Explanation

Using a Suitably Labelled Genetic Diagram
father
IBIO
motherIAIAIBIAIO
IOIBIOIOIO

O blood group

Blood Types of Offspring

Passage

Reproduction is a characteristic of all living organisms.

Question 277 (1 of 4 Based on Passage)

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A specialized cell performs a particular function.

Sperm and egg cells are two types of specialized cell that are involved in reproduction in humans.

State the names of two other specialized cells.

Explanation

Specialized blood cells, specialized nerve cells and specialized muscle cells.

  • Blood: Blood is a connective tissue, fluid matrix of blood is plasma having wandering or floating cells, called corpuscles, blood helps in the transportation of various materials such as nutritive substances, gases, excretory products, hormones etc.
  • Neuron: They are highly specialized tissue due to which the animals can perceive and respond to the stimuli. Their functional unit is called as nerve cell or neuron. Cell body is called cyton which is covered by plasma membrane.
  • Muscular Tissue: Movements are brought about in our body with the help of muscular tissues. They are long fiber-like cells called muscle fibers. They are capable of contraction or relaxation. Types of Muscular Tissue are Striated muscles, cardiac muscle fibers and Non-striated muscles.

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