Pedigree charts

Question 1

When is a trait said to be recessive?

Answer 1

If it skips a generation

meaning the parents must be carriers but do not show the traits in their phenotype

Question 2

When is a trait said to be dominant?

Answer 2

When the trait does not skip a generation

Question 3

When is a trait said to be x-linked recessive?

Answer 3

When the mother is homozygous recessive and passes on the same recessive allele to her son, as there is no option of inheriting a dominant allele
IF NOT IT IS AUTOSOMAL RECESSIVE

Question 4

When is a trait said to be x-linked dominant?

Answer 4

When the father is affected and the daughter is affected, as there is no chance of inheriting a homozygous recessive allele.