What is a virus envelope in biology?

The Virus Envelope is where the capsid is surrounded by lipid bilayer that contains viral proteins, usually including the proteins that would enable the virus to bind to the host cells. and is derived from the host cell membranes. They may help viruses avoid the host immune system. The viral envelope then fuses with the host's membrane, allowing the capsid and viral genome to enter and infect the host.

i think it is dna, i'm not totally sure but i think it might be.

the answer would be 2, if crossing over doesn’t occur 2 out of 4 of the daughter cells will have that allele.

hope this : )