Principles of Inheritance and Variation. — Bio Zoology STD 12 — Question
Tamilnadu BoardEnglish MediumSTD 12Bio ZoologyPrinciples of Inheritance and Variation.3 Marks
Question
Explain XX-XO type of sex determination.
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Answer
XX-XO method of sex determination is seen in bugs, some insects such as cockroaches and grasshoppers. Pi The female with two X chromosomes are homogametic Gametes (XX) while the males with only one X chromosome are heterogametic (XO). The presence of an unpaired X chromosomes determines the male sex. The males PI Generation with unpaired ‘X’ chromosome produce two types of sperms, one half with X chromosome and other half without X chromosome. The sex of the offspring depends upon the sperm that fertilizes the egg.
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