Science
In snails individuals can begin life as male and depending on environmental conditions they can become female as they grow. This is because
options
- Male snails have dominant genetic makeup.
- Female snails have dominant genetic makeup.
- Expression of sex chromosomes can change in a snail’s life time.
- Sex is not genetically determined in snails.
Answer
Sex is not genetically determined in snails.
Reason — In snails, sex determination depends on environmental conditions rather than fixed sex chromosomes. Many snail species are protandric hermaphrodites, meaning individuals start life as males and later develop female reproductive organs as they grow or when environmental factors—such as population density, temperature, or availability of mates—change.
This shows that the expression of sex is flexible and not genetically predetermined as in humans or other animals with distinct sex chromosomes.
Hence, the correct explanation is that sex is not genetically determined in snails.
Related Questions
Which of the following adaptations in herbivores helps in digestions of cellulose?
options
- Longer large intestine
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- Longer small intestine
There was a cerebellar dysfunction in a patient. Which of the following activities will get disturbed in this patient as a result of this?
options
- Salivation
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In the following cases, a ray is incident on a concave mirror. In which case is the angle of incidence equal to zero?
options
- A ray parallel to the principal axis.
- A ray passing through the centre of curvature and incident obliquely.
- A ray passing through the principal focus and incident obliquely.
- A ray incident obliquely to the principal axis, at the pole of the mirror.
Choose the correct option for the colour of rays for A and B.
Colour of Ray A Colour of Ray B A. Blue Red B. Green Yellow C. Red Violet D. Violet Indigo options
- A
- B
- C
- D