Why do chromosomes look like an x?

Complete the possible outcomes for each generation in the pedigree chartaa aa aa

Why is the theory of evolution important? it disproves all other theories about how life began. it provides a topic for debate. it is a unifying concept in biology. it explains how life began. i know for sure, it is not "it is a unifying concept in biology."

What is the process of a new plant growing from its seed into a seedling? primary growth fertilization pollination germination