Which statement best describes the relationship between an allele and a gene? A
An allele is a variation of a gene that can be expressed as a phenotype.

B
An allele is a segment of a DNA molecule that controls replication of a gene.

C
An allele is the primary protein made by a gene found in a developing embryo.

D
An allele is the part of a gene that attaches to messenger RNA molecules.

A) an allele is a form of a gene. There are at least two alleles for any given gene.

Explanation:

sand 60

clay 10

silt 30

sandy loam should be dominated by the sand. as the amount of sand increased, the amount of slit needed to anchor the plants' roots to the sand will also be increased. even though the amount is very little, 10% part of clay is still necessary for proper oxidation.

d. organisms have cells with different shapes and functions.