Mustache and beard in males are examples of which of the following?

Which of the following is not a sex-linked trait?

Which of the following variations are temporary and have nothing to do with the last or next generation?

Improvement of the human race through hereditary qualities is called:

Which of the following statements are false?
$I.$ $A$ dominant allele determines the phenotype when paired with a recessive allele.
$II.$ $A$ recessive allele is weaker than a dominant allele.
$III.$ $A$ recessive allele does not show its effects when paired with a dominant allele.
$IV.$ $A$ dominant allele is always better for an organism.

Dominant epistasis is shown by