(a) Giving two examples, justify the statement that the sex of the offspring in all animals is not always…
(a) Giving two examples, justify the statement that the sex of the offspring in all animals is not always genetically determined.
(b) Differentiate between the sex chromosomes of male and female human beings.
Solution
(a)
• In a few reptiles, the temperature at which fertilised eggs
are kept determine whether the animal developing from
the eggs will be male or female.
• In snails, individuals can change sex.
(or any other suitable example)
(b)
Male sex chromosome Female sex chromosome
Male has a mismatched pair Female has a perfect pair i.e.
i.e, ‘XY’ chromosomes. ‘XX’ chromosomes.
Both X chromosomes are of
Y chromosome is smaller
than X chromosome. same size.
(Any one difference, Any other difference)