Question

question 5
which of the following is true for autosomal recessive alleles associated with a disease?
one copy of the allele will cause the disease.
an individual who shows the disease must have at least one parent with the disease.
two copies of the allele are required for the individual to be affected.
these alleles are seen more frequently in males.

Explanation:

Autosomal recessive alleles require two copies (homozygous recessive genotype) for the individual to express the associated disease. One copy makes the individual a carrier. An affected individual's parents can both be carriers without showing the disease. Autosomal - not sex - linked traits are not more frequent in males.

Answer:

C. Two copies of the allele are required for the individual to be affected.