Which allele combination represents a female who has a heterozygous sex-linked trait?
0 xry
o xy
0 xrx
o xrxr

Astudent observes a star from two positions of earth in its orbit, in summer and winter, and measures the change in the position of the star. which of these can be best calculated by this method?

Explain light independent reactions

Which feature of a human community is similar to a niche in a biological community