What is the number of chromosomes in the gamete cells of a housefly?

Which of the following are the main categories of genetic disorders?

Match the terms in Column $I$ with its phenotypic ratio in Column $II$ correctly and choose the correct option.

Column $I$	Column $II$
$i$. Monohybrid test cross	$a$. $1:2:1$
$ii$. Incomplete dominance	$b$. $1:2$
$iii$. Law of independent Assortment	$c$. $1:1$
$iv$. Sickle Cell Anaemia	$d$. $9:3:3:1$

In humans, albinism is controlled by a recessive gene '$a$'. If both parents are known to be carriers $(Aa)$ for albinism, what is the probability of having $1$ normal and $3$ albino children in a family of $4$ (in $/256$)?

For obtaining a hybrid ratio,which characters of the plant are taken into account?

When two individuals are similar in external appearance but differ in their genetic makeup,they are called as: