Think and discuss: suppose there are two homologous chromosomes. each chromosome contains a single mutant allele in different parts of the chromosome. how can crossovers be beneficial in this situation? (hint: how can you create a single, mutation-free chromosome? )

When the crossing over results in both mutant alleles on one chromosome and the other chromosome will be mutation free.

During the meiosis chromosomes are present in homologous form in a pair.

They exchange their genetic material with each other. This exchange is random and usually genetic material on the ends/telomere changes with the homologous chromosome.

In given condition the exchange is in such manner that the mutant allel of one chromosome shifts to other during crossing over. While other chromosome also contains its own mutant allele and does not exchange it during crossing over.

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%

ionic bonds are two oppositely charged ions that attract. a sodium ion has a 1 positive charge; a chloride ion has a 1 negative charge. sodium and chloride have oppostive charged ions that attract which forms an ionic bond. a chemical bond formed when two atoms share electrons is called