A eukaryotic diploid cell from an organism with the ZZ-ZW sex determination system has two pairs of autosomes and a pair of sex chromosomes. The individual from which this cell most probably came is a bird. Sex determination in birds is ZZ-ZW type. ZZ is male and ZW female.
Sex chromosomes are specific pair of chromosomes that represents the sex of an individual. The sex chromosomes in birds are designated Z and W, the male is the homomorphic sex (ZZ), and the female is heteromorphic (ZW). In most avian species the Z chromosome is a large chromosome, usually the fourth or fifth largest and it contains almost all the known sex-linked genes.
The W chromosome is generally a much smaller microchromosome, containing a high proportion of repeat sequence DNA. In this case, the total number of chromosomes is the same in both male (ZZ) and female (ZW), but the female produces two different types of gametes in terms of sex chromosomes.
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