Crossing over occurs at the four-strand stage when two homologous chromosomes, each consisting of a pair of sister chromatids, are paired. Each crossover involves just two of the four strands and generates two recombinant strands.
Hope this helps!
Answer:
Oncogenes.
Explanation:
Cancer is the harmful disease that causes several death in the world. Cancer occur due to the mutation in the genes that are responsible for the regulation of apoptosis and cell divisions.
The virus are also oncogenic in nature and can cause several different type of cancer. The human papilloma virus can be transmitted from the skin contact. The virus cause cervical cancer and genital warts. The integration of this virus into host genome increases the expression of viral oncogenes in the host DNA.
Thus, the answer is oncogenes.
Answer:
C) Books about the lives of inventors, explorers, and artists.
Explanation:
A biography is a book about a person's life that was written by somebody else. Option C) Books about the lives of inventors, explorers, and artists best fits this description. Therefore books in the biography genre would include books about the lives of inventors, explorers, and artists.
This type of asexual reproduction is called apomixis.
Apoximis is reproduction by special generative tissues without fertilization. It includes parthenogenesis in animals, in which the new individuals develop from unfertilized egg, and apogamy in certain plants in which the generative tissues may be the sporophyte or the gametophyte.
Answer:
Cell X
Explanation:
Prokaryotes do not have a nucleus or any other membrane-bound organelles (including chloroplasts). So cell X is a prokaryote.
