Q.
Which of the following males are not heterogametic?
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NTA AbhyasNTA Abhyas 2020Principles of Inheritance and Variation
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Solution:
Grasshopper is an example of an XO type of sex determination in which males have only one X chromosome beside autosomes, whereas females have a pair of X-chromosome. A large number of Insect show XO type of sex determination. While some of its sperm bear an X-chromosome and others do not have X-chromosome.
The XX/XY sex-determination system is the most familiar, as it is found in humans and Drosophila. In the system, females have two of the same kind of sex chromosome (XX), while males have two distinct sex chromosomes (XY).
The ZW sex-determination system is found in birds, reptiles, some insects and other organisms. The ZW sex-determination system is reversed compared to the XY system: females have two different kinds of chromosomes (ZW), and males have two of the same kind of chromosomes (ZZ).