Principle of Inheritance and VariationEasyBloom L3
Question
Sex determination in grasshoppers, humans, and Drosophila is similar because
Options
A.females are hemizygous.
B.males have one X chromosome and females have two X chromosomes.
C.all males always have one Y chromosome in all three species.
D.the ratio of autosomes to sex chromosomes is the same in all three organisms.
Solution
Sol.(b) [Key Concept: Sex Determination — XX Female XY/XO Male] Sex determination in grasshoppers (XX=female, XO=male), humans (XX=female, XY=male), and Drosophila (XX=female, XY=male) is similar because in all three: FEMALES have TWO X chromosomes and MALES have ONE X chromosome. The key similarity is the XX=female relationship. The mechanisms differ (grasshoppers lack Y; Drosophila uses X:A ratio; humans use SRY gene on Y), but the XX=female, X*=male pattern is common.
Create a free account to view solution
View Solution FreeTopic: Principle of Inheritance and Variation·Practice all Principle of Inheritance and Variation questions
More Principle of Inheritance and Variation Questions
A gene located on Y-chromosome and therefore, transmitted from father to son is known as...Diploid chromosome number in humans is...A hybrid is generally more vigorous than either of the parents, this is due to...An individual exhibiting both male and female sexual characteristice in the body is known as...Mendel′s work was got republished in ′Flora′ by...