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Q.

Male heterogamety is observed in

(a) XX-XY type    (b) XX-XO type       (c) ZW-ZZ type      (d) Haplodiploidy 

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a

(a) and (b)

b

(a) and (c)

c

(b) and (c)

d

(a) and (d)

answer is A.

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Detailed Solution

In male heterogamety, male produces two different types of gametes.

In XO type half of the male gametes are with X chromosome while the other half lack any allosome.

In XY type, half of the male gametes bear X chromosome while the other half bear Y chromosome. 

 

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