Question

A heterozygous individual carrying recessive sex linked gene is called as

• A. Carrier
• B. Crossing over
• C. Transmitter
• D. Albino

Answer 1

Answer: (A)

Carrier

An individual who has a recessive, disease-causing allele at a particular locus on one chromosome of a pair and a normal allele at that locus on the other chromosome is called a carrier. A carrier is an individual, who carries and is capable of passing on a genetic mutation associated with a disease and may or may not display disease symptoms. Carriers are associated with diseases inherited as recessive traits. In order to have the disease, an individual must have inherited mutated alleles from both parents. An individual having one normal allele and one mutated allele does not have the disease.
For example: In the given diagram, an unaffected woman carries one copy of a gene mutation for an X-linked recessive disorder. She has an affected son, an unaffected daughter who carries one copy of the mutation, and two unaffected children who do not have the mutation.