Write the types of sex-determination mechanisms the following crosses show. Give an example of each type.
Write the types of sex-determination mechanisms the following crosses show. Give an example of each type.
(i) Female XX with Male XO
(ii) Female ZW with Male ZZ
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(i) Male heterogamety, Grasshopper.
(ii) Female heterogamety, Birds
Detailed answer:
Sex determination mechanism in usually chromosome at and is of following type.
(1) XX-XY type found in mammals and some insects like Drosophila.
(2) XX-XO type found in grasshoppers etc.
(3) ZW-ZZ type found in Birds.
(4) ZO-ZZ type found in butterflies etc.
(a) Male heterogamety i.e., -- grasshopper
(b) Female heterogamety - birds
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