bio question on sickle cell?

Question

Edward was found to be heterozygous for sickle cell trait. The alleles represented by the letters B and b are

on the X and Y chromosome
on the same chromosome
on homologous chromosomes
both present in one of Edward’s sperm cells


its either the 2nd or 3rd... homologous just means that its the same chromosome, just with a different....versions of the genes... is that possible for sickle cell?

Answer 1

Homologous chromsosomes are the two chromosomes that make up a matching pair. One is contributed by each parent.

If he's heterozygous, one chromosome has the "B" allele, and the other has the "b" version.

The alleles can't be on the same chromosome, since each parent contributes one allele.