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Question
Sex determination in animals such as humans and insects is done using the XX-XO and XX-XY mechanisms. In some organisms ZZ-ZW mechanism of sex determination is seen.
Based on the given statement, answer the question given below.
What led to the initial development of the concept of the genetic basis of sex determination?
[1 mark]
Sex determination in animals such as humans and insects is done using the XX-XO and XX-XY mechanisms. In some organisms ZZ-ZW mechanism of sex determination is seen.
Based on the given statement, answer the question given below.
What led to the initial development of the concept of the genetic basis of sex determination?
[1 mark]
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Solution
The correct option is C Cytological observations in insects
Some of the experiments carried out on insects had given the clue about the genetic basis of sex determination. The cytological observations made in several insects led to the development of the concept of the genetic basis of sex determination.
For example, during a cytological study conducted by Henking (1891) on the chromosomes of firebugs, it was observed that only 50% of the sperms had a specific structure after spermatogenesis. This was later given the name X - chromosome.
Some of the experiments carried out on insects had given the clue about the genetic basis of sex determination. The cytological observations made in several insects led to the development of the concept of the genetic basis of sex determination.
For example, during a cytological study conducted by Henking (1891) on the chromosomes of firebugs, it was observed that only 50% of the sperms had a specific structure after spermatogenesis. This was later given the name X - chromosome.
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