$A$ cross between a homozygous recessive and a heterozygous plant is called:

The alleles are

Which of the following characters was not studied by Mendel in his pea plant experiments?

Mendel published his work on the inheritance of characters in $1865$,but it remained unrecognized until $1900$ because:
$(a)$ He could not provide any physical proof for the existence of factors.
$(b)$ His concept of factors as stable,discrete units that controlled the expression of traits did not find acceptance from his contemporaries.
$(c)$ Mendel's approach of using mathematics to explain biological phenomena was considered ahead of its time and unconventional.
$(d)$ Communication was not easy (as it is now),and his work could not be widely publicized.

$A$ pure line organism is one that produces individuals of:

Read the following statements.
Statement $I$: In a typical test cross, an organism showing a dominant phenotype is crossed with the recessive parent.
Statement $II$: The ratio of organisms showing dominant and recessive traits in $F_1$ generation of a test cross indicates that the organism with unknown genotype is homozygous dominant.
Choose the correct option.