1.

Describe sex determination in certain Birds.

Answer»
  • In birds, sex determination is of ZW type, both males and females have same number of chromosomes.
  • The males have autosomes plus a pair of Z- chromosomes.
  • The females along with autosomes ZW chromosomes.
  • The males are homogametic and produce sperms carrying one Z – chromosome along with autosomes.
  • The females are heterogametic and produces 50% of ova carrying one Z – chromosome and the remaining 50% carrying one W – chromosomes.
  • Sex of the individual is determined by the type of ovum fertilized.
  • When an ovum containing Z chromosome is fertilized; the zygote (ZZ) develops into male.
  • When an ovum containing W chromosome is fertilized; the zygote (ZW) develops into female.


Discussion

No Comment Found

Related InterviewSolutions