Why does a Drosophila have only 4 linkage groups when 8 chromosomes are present?

From what I understand, all the genes present on one chromosome constitute one linkage group. Then, Drosophila should have 8 linkage groups. Does this mean we are counting only one linkage group from each pair of homologous chromosomes? If so, then why?

Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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