Which of the following is a placental mammal and not a marsupial?

Select the correct match.

Sex-influenced characters are due to

Which of the following is a dominant trait?

Which disease is caused by an $X$-linked recessive gene but is not lethal?

How many sentences are correct?
$(i)$ Every gene contains the information to express a particular trait.
$(ii)$ Gene responsible for $\beta$-thalassemia is present on the $11^{th}$ pair of autosomal chromosomes.
$(iii)$ Mendel's approach of using mathematics to explain biological phenomena was totally new and unacceptable to many of the biologists of his time.