Chromosomes contain DNA molecules highly packaged and wound around histone proteins. Each chromosome has two chromatids joined together at a point called centromere. Crossover is a process that take place during meiosis 1 ( first phase of meiosis), it enhances the exchange of genetic material. During cross over the non-sister chromatids of chromosomes fuse at chiasma where exchange of genetic material takes place.Therefore, it will be correct to say that crossover creates sister chromatids that are different, because non-homologous sister chromosomes have swapped genetic material with one another.
Answer:
An organ that helps with digestion but is not part of the digestive tract. The accessory digestive organs are the tongue, salivary glands, pancreas, liver, and gallbladder.
Answer:
Option (D).
Explanation:
Different DNA polymerase are present in eukaryotes that are necessary for the replication of the DNA. DNA polymerase composed of four subunits : POLD2, POLD1, POLD4, and POLD3.
The DNA polymerase delta are involved in the DNA synthesis. This polymerase has both the exonuclease activity and proofreading ability of newly synthesized DNA.
Thus, the correct answer is option (d).