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NEET BIOLOGYMedium

Select the correct statement/s with respect to mechanism of sex determination in Grasshopper. A: It is an example of female heterogamety B: Male produces two different types of gametes either with or without X chromosomes. C: Total number of chromosomes (autosomes and sex chromosomes) is same in both males and females. D: All eggs bear an additional X chromosome besides the autosomes.

Choose the correct answer from the options given below:

A

(B) and (D) only

B

(A), (C) and (D) only

C

(A) only

D

(A) and (C) only

Step-by-Step Solution

:

  • Statement A is False: Grasshoppers exhibit male heterogamety (XO type), where males produce different types of gametes (with or without X), while females (XX) are homogametic .
  • Statement B is True: Males have an XO sex chromosome composition, so they produce two types of sperms: 50% with an X-chromosome and 50% without it .
  • Statement C is False: Females have a pair of X-chromosomes (XX), while males have only one (XO). Therefore, the total number of chromosomes is not equal; males have one less chromosome than females .
  • Statement D is True: Since females are XX (homogametic), all eggs produced bear an X-chromosome besides the autosomes .
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