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  • In human, the sex determination is based on the gametes contributed by ______ because they are _______ and produce _______ types of gametes. Fill in the blanks using the appropriate optio

In human, the sex determination is based on the gametes contributed by ______ because they are _______ and produce _______ types of gametes.

Fill in the blanks using the appropriate option:

Option: 1

females; heterogametic; two


Option: 2

males; homogametic; one


Option: 3

males; heterogametic; one

 


Option: 4

males; heterogametic; two


Answers (1)

best_answer

 

 

As learnt in Sex Determination: XX Female & XY Male Type -

  • In most insects (e.g., fruit fly) and mammals including humans, the female is homogametic (XX) and male is heterogametic (XY) consisting of two dissimilar chromosomes X and Y.
  • The females produce ova all of one type having X chromosome. 
  • Males produce two types of sperm: -50% with X-chromosome and the remaining 50% with Y-chromosome. 
  • Thus, the sex chromosomes in females are homomorphic and those of males are heteromorphic.
  • In fertilization, an ovum can only carry an X chromosome. It is, therefore, the sex chromosome found in the sperm – either X or Y – that determines whether a zygote will be female or male, respectively.

Hence, the correct answer is option d.

Posted by

vishal kumar

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