Which Igneous Rock Has Dark Color (Low Silica Content) and Small

question 115

Multiple Choice

Which igneous rock has dark color (low silica content) and small grains (fine texture) ?

• A) Gabbro
• B) Granite
• C) Rhyolite
• D) Basalt

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Definitions:

Heterozygous Individual

A heterozygous individual possesses two different alleles of a gene for a particular trait, resulting in genetic variation.

Different Alleles

Variations or alternative forms of a gene that can exist at a single locus (position) on a chromosome.

Dominant Allele

An allele that expresses its phenotypic effect even when heterozygous with a recessive allele; it masks the effect of a recessive allele.

Heterozygous Individuals

Individuals having two different alleles at a particular genetic locus, one inherited from each parent.