MCQ
Infertility in males can be caused due to:
- ACryptorchidism
- BAlchoholism
- CThyroid dysfunction
- DAll of the above
Explanation:
In cryptorchidism, testes are unable to descend in scrotal sacs so that sperms are not produced.
On the other hand, alcoholism reduces the sperm count & thyroid dysfunction also reduces sperm motility.
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$(i)$ Every gene contains the information to express a particular trait.
$(ii)$ Gene responsible for $\beta$ - thalassemia is present on $21^{st}$ pair of autosomal chromosome.
$(iii)$ Mendel's approach of using mathematics to explain biological phenomena was totally new and unacceptable to many of the biologists of his time.