Which is the male genotype in the zw sex chromosome system. a. zy b. zz c. xz d. zw

The correct answer is B. ZZ

The sex chromosomes in birds are depicted as Z and W. In most of the bird species, the Z chromosome is large and contains almost all the sex-linked genes whereas, the W sex chromosome is much smaller have a high proportion of repeat sequence DNA. The male bird is homogametic having genotype (ZZ) and the female bird is heterogametic (ZW).  

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.

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.'