The sex-determining system in which males are XY and females are XX is found in all
A) Multicellular organisms
(B} Animals
C) Vertebrates
(D) Mammals
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The sex-determining system in which males are XY and females are XX is found in all
A) Multicellular organisms
(B} Animals
C) Vertebrates
(D) Mammals
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Answer:
The XX/XY sex-determination system is the most familiar, as it is found in humans. The XX/XY system is found in most other mammals, as well as some insects. In this system, most females have two of the same kind of sex chromosome (XX), while most males have two distinct sex chromosomes (XY).
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《 D 》 Mammals
The variability of sex-determination systems is the evidence that it has been evolved many times in animal and plant species. Men determine the sex of a baby depending on whether their sperm is carrying an X or Y chromosome. An X chromosome combines with the mother's X chromosome to make a baby girl (XX) and a Y chromosome will combine with the mother's to make a boy (XY).