Question

Read the passage given below and answer the question that follow:

Analysis of the pattern of inheritance of a particular trait through several generations of a family is called pedigree analysis. A graphic representation of the same is called a pedigree chart. It may be used to guess the probability of a child inheriting the trait under study. pedigree chart is drawn by using a standard set of symbols.

In a pedigree chart, if a trait shows criss-cross pattern of inheritance then it is ______.

Options

• An autosomal dominant trait

• An autosomal recessive trait

• An X-linked dominant trait

• An X-linked recessive trait

Answer 1

In a pedigree chart, if a trait shows criss-cross pattern of inheritance then it is an X-linked recessive trait.

Explanation:

In a pedigree chart, if a trait shows a criss-cross pattern of inheritance, it is an X-linked recessive trait. This pattern occurs because affected males pass the gene to their daughters (carriers), who then pass it to their sons, resulting in the trait skipping generations through females. Hence, the correct answer is an X-linked recessive trait.