what is pedigree analysis?
Answers
Answer:In the case of autosomal genes:
It equally affects both males and females.
In the case of sex-linked genes:
Affects the males as they are hemizygous.
The gene shows criss-cross inheritance i.e., the gene from the father is transferred to the grandson through the daughters.
In the case of a sex-linked dominant gene, more females are affected than males.
Never transferred from father to son.
In the case of dominant genes:
One or both the parents have the disorder.
It expresses itself in every generation.
The disorder is common in the pedigree.
The genotype is either homozygous (BB) or heterozygous (Bb).
It affects one-half of the children.
In the case of recessive genes:
Neither of the parents may have the disorder.
The disorder is rare in the pedigree.
Both parents are either heterozygous or homozygous recessive.
The disorder skips generations.
The genotype is always homozygous (bb).
Affected offspring are born to unaffected parents.
In the case of Holandric ( Y-linked) genes:
Affects the males only.
Father transfers it to son.
It never skips generations.
In the case of Cytoplasmic genes:
Gene is inherited from mother.
Affected mother transfers the gene to all its offspring.
Pedigree 1:
sex-linked recessive
A sex-linked recessive character.
It mainly affects the males.
The gene skips generation.
Criss-cross inheritance is seen.
Pedigree 2:
autosomal dominant
It is an autosomal dominant character.
It affects male and female equally.
The gene expresses itself in each generation.
Pedigree 3:
autosomal recessive
It is an autosomal recessive character.
The gene skips generation.
Does not show criss-cross inheritance.
Pedigree 4:
It is a holandric gene.
As it affects only males.
The gene is transferred from father to son.
Explanation:hope this helps u plz mark me as the brainliest
Answer:
Hiii...
Pedigree analysis is a tabular representation of a family history made by taking a particular character or a disease into consideration....
Hope this helps...❤❤☺☺