Inheritance of Autosomal Recessive Traits in Pedigree Analysis
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Questions and Answers

What type of genetic disorders are caused by defects in one particular gene due to changes or mutations in the DNA?

  • Polygenic disorders
  • Multifactorial disorders
  • Chromosomal disorders
  • Monogenetic disorders (correct)

What is the pattern of inheritance of autosomal dominant disorders?

  • Only in males
  • Expressed in the heterozygous condition (correct)
  • Expressed in the homozygous condition
  • Only in females

Which type of inheritance does not differ between males and females?

  • Mitochondrial
  • X-linked
  • Autosomal recessive
  • Autosomal dominant (correct)

What is the term for the study of the inheritance of genetic disorders and diseases?

<p>Mendelian inheritance (B)</p> Signup and view all the answers

What is the name of the well-known autosomal dominant disorder that is an example of autosomal dominant inheritance?

<p>Huntington's disease (D)</p> Signup and view all the answers

How many pairs of non-sex chromosomes are there in humans?

<p>22 (C)</p> Signup and view all the answers

What type of trait is depicted in the pedigree shown in Figure 4.35?

<p>Autosomal recessive (B)</p> Signup and view all the answers

What is the genotype of the unaffected male and female children in the fourth generation of the pedigree?

<p>Homozygous dominant (C)</p> Signup and view all the answers

What is the probability of the heterozygous male child in the fourth generation exhibiting the trait?

<p>0% (A)</p> Signup and view all the answers

What is the main purpose of pedigree analysis in genetics?

<p>To predict the expression of a trait in future generations (B)</p> Signup and view all the answers

What is the advantage of analyzing a pedigree in a family with a history of a genetic disorder?

<p>It can provide information about the risk of disease inheritance and propagation (A)</p> Signup and view all the answers

How many genotypes are possible for a family member in a pedigree, assuming a single autosomal recessive trait?

<p>3 (B)</p> Signup and view all the answers

What is the condition in which an autosomal recessive disorder will most commonly occur?

<p>When both parents carry the trait and the offspring receives the defective gene from each parent (C)</p> Signup and view all the answers

What is the genotype of a person who is a carrier of an autosomal recessive disorder?

<p>Rr (D)</p> Signup and view all the answers

In a Punnett square, what is the probability of a child inheriting the allele for albinism (r) if both parents are carriers (Rr)?

<p>25% (A)</p> Signup and view all the answers

What is the difference between autosomal dominant and autosomal recessive inheritance?

<p>Autosomal dominant is expressed in heterozygous conditions, while autosomal recessive is expressed in homozygous recessive conditions (C)</p> Signup and view all the answers

What is the type of inheritance pattern shown by most forms of albinism in humans?

<p>Autosomal recessive (B)</p> Signup and view all the answers

What is the reason why both parents can be carriers of an autosomal recessive disorder but be unaffected themselves?

<p>Because they are heterozygous and the normal allele is dominant (A)</p> Signup and view all the answers

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