A) ZZ-ZW
B) XX-XY
C) XO-XX
D) ZZ-WW
Correct Answer: A
Solution :
ZW - ZZ system of sex determination occurs in certain insects (gypsy moth) and vertebrates such as fishes, reptiles and birds and plants such as Fragaris elatior. The female sex has one Z-chromosome and one W-chromosome, ie, heterogametic and produces two types of ova. The male sex has two homomorphic Z-chromosomes and is homogametic producing single type of sperms. XX - XO system of sex determination is found in certain plants (eg, Vallisneria spiralis, Dioscorea sinuatd) and insects especially those of order-Hemiptera and Orthoptera. The female is homogametic, while the male is heterogametic. XX - XY system of sex determination occurs in man, other mammals certain insects including Drosophila and Lygaeus turcicus and in certain angicspermic plants. The female is homomorphic, while the male is heteromorphic.You need to login to perform this action.
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