An alternative of a gene is reffed to as

gene (in diploids, one member of a pair) that is located at a specific position on a specific chromosome. ... An organism which has two different alleles of the gene is called heterozygous.

Explanation:

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answer: grassland biomes are closer to the equator and receive more rain.

grasslands are biomes that are dominated by grasses rather shrubs and trees. savanna are biomes that exhibit grasses, shrubs and small tree as vegetation. grasslands are located near the equator of the earth. these are found in north america. savanna biomes are found in africa, south america, australia and india. grassland exhibit moderate climatic conditions, it receives   amount of rainfall higher than savanna.   therefore, savanna exhibit dry and hot climatic conditions.