PDF chapter test TRY NOW
\(XX-XO\) type:
Some insects like grasshoppers, cockroaches and roundworms have the \(XX\)-\(XO\) type of sex determination system.
Heredity of sex chromosomes in XO sex determination
\(ZW\)-\(ZZ\) type:
In this type of sex determination, females are heterogametic, producing two types of gametes (\(Z\) and \(W\)), whereas males are homogametic, producing only one type of gametes (\(ZZ\)). This type of sex determination can be observed in birds as well as some reptiles.
Sex determination in birds
\(Z0\)-\(ZZ\) type:
Females have an odd sex chromosome (\(AA\)+\(Z\)) in the \(ZO\)-\(ZZ\) type of sex determination, whereas males have two homomorphic sex chromosomes (\(AA\) + \(ZZ\)). This type of sex determination can be observed in butterflies and moths.
Sex determination in butterfly
Important!
Do you know!
Organisms like wasps and bees have no sex chromosomes.
Organisms like wasps and bees have no sex chromosomes.
Reference:
https://www.genderinclusivebiology.com/newsletter/sex-determination-why-so-many-ways-of-doing-it
https://www.wikiwand.com/en/Sex-determination_system
https://www.slideserve.com/amos/factors-affecting-on-sex-reversal-of-fishes