Afemale fly is heterozygous for three x-linked genes. the dominant alleles are abc and the recessive alleles are abc. she is crossed with an abc/y male. the following progeny phenotypes are produced. these phenotypes are equally divided between male and female flies. abc 420 abc 435 abc 55 abc 60 abc 14 abc 16 approximately how many double crossovers progeny would you have expected to see in the total of 1,000?

ans.

dna fingerprinting is defined as a process that determines the dna characteristics of an individual. these dna characteristics are unique among individuals as their fingerprints, so it is known as dna fingerprinting.

steps of dna fingerprinting includes extraction of dna from sample, amplification of dna, restriction digestion of amplified dna, and then analysis of dna by gel electrophoresis, respectively.

thus, the next step performed by the scientist is 'to cut the amplified dna (obtained by polymerase chain reaction) by restriction enzymes that cleave the dna into fragments and their analysis.'

these muscles maintain the blood pressure in the vessels. the smooth muscles are innervated by nerves of the autonomic nervous system. when the muscles contract, they cause vasoconstriction of the vessels and increase blood pressure. when the muscles relax, they enable vasodilation of the   blood vessels hence reduce blood pressure.