In the Human Retina

question 21

Multiple Choice

In the human retina,

• A)cone cells can detect colour, but rod cells cannot.
• B)cone cells are more sensitive than rod cells to light.
• C)cone cells, but not rod cells, have a visual pigment.
• D)rod cells are most highly concentrated in the centre of the retina.
• E)rod cells require higher illumination for stimulation than do cone cells.

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Definitions:

Chromosome 19

One of the 23 pairs of chromosomes in humans, known for containing genes that are involved in a wide range of bodily functions and diseases.

Colorectal Cancer

A type of cancer that begins in the colon or rectum, part of the digestive tract, and can involve either malignant tumors or polyps.

Alleles

Different forms of a gene that arise by mutation and are found at the same place on a chromosome.

Cross Over

The exchange of genetic material between homologous chromosomes during meiosis, leading to new genetic combinations.