Answer:
(d) Most sex-linked (X-linked)
conditions are recessive. This means that in a person with two X-chromosomes
(females), both copies of a gene I.e., one on each X-chromosome),must have a
change or mutation whereas in a person with one X-chromosomes(males), only one
copy of a gene must have a mutation.
A female with a mutation in one copy of
a gene on the X-chromosome is said to be a 'carrier' for an X-linked condition.
For X-linked recessive disorders, an
unaffected carrier mother who has a mutation in a gene on the X-chromosome can
transmit either the X-chromosome with this mutation or a normal X-chromosome to
her children.
Autosomal dominant inheritance
refers to the pattern of inheritance of a condition directly or indirectly due
to a dominant faulty gene located on auto some.
Autosomal recessive inheritance
is the condition caused directly or indirectly due to are cessive faulty gene
copy on auto some, Sex-linked dominant is a rare trait that is caused by a
single abnormal gene on the X-chromosome.
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