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Match the pedigree to the correct type of inheritance.

Match the pedigree to the correct type of inheritance.-example-1
User Maohieng
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1 Answer

4 votes

Answer:

Pedigree 1 - Autosomal recessive

Pedigree 2 - Sex-linked recessive

Pedigree 3- Sex- linked dominant

Pedigree 4- Autosomal Dominant.

Step-by-step explanation:

Pedigree 1 shows Autosomal recessive inheritance because: (refer attachment)

  • Disease is not present in parents and only in one child
  • Parents are heterozygous for autosomal trait. hence their genotype is Aa.
  • Absence of trait in heterozygous individual shows that it is a recessive trait.

Pedigree 2 shows Sex- linked recessive disorder because:

  • The disease appears almost always in males.
  • in the second generation the daughter is effected but her husband is not.
  • But again their daughters are unaffected while all sons are affected.

Pedigree 3 shows Sex link dominant inheritance because:

  • Affected female transmitted the disease to her son.
  • Effected father has all effected daughter.

Pedigree 4 shows Autosomal dominant inheritance because:

  • Each affected individual has an affected parents.
  • Since both parents have the disease and their daughter does not this shows that the parents are heterozygous for the trait and the trait is Dominant.

[ Refer to the attatchment ]

Match the pedigree to the correct type of inheritance.-example-1
Match the pedigree to the correct type of inheritance.-example-2
Match the pedigree to the correct type of inheritance.-example-3
Match the pedigree to the correct type of inheritance.-example-4
User Nasser
by
7.2k points