Figure 18.2 -Figure 18.2 Shows a Diagram of Blocks of Genes on Genes

question 16

Multiple Choice

Figure 18.2
-Figure 18.2 shows a diagram of blocks of genes on human chromosome 16 and the locations of blocks of similar genes on four chromosomes of the mouse. What does the movement of these blocks in the genomes suggest?

• A) During evolutionary time, these sequences have separated and have returned to their original positions.
• B) DNA sequences within these blocks have become increasingly divergent.
• C) Sequences represented have duplicated at least three times.
• D) Chromosomal translocations have moved blocks of sequences to other chromosomes.

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Definitions:

Dessication

the process of drying out or dehydrating, often leading to the death of plants and animals in an ecosystem.

Deforestation

The large-scale removal of trees from forests or jungles, often to clear land for agricultural, residential or commercial development.

Overgrazing

The depletion of vegetation due to continuous feeding by an excessive number of grazing animals, leading to land degradation.

Water Scarcity

A situation in which the available water resources are insufficient to meet the demands of a region.