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Chapter 14: Problem 15

Match the chromosome terms appropriately. ______polyploidy _______ deletion ______ aneuploidy _______ translocation _______ syndrome _______ transposable _______ element a. symptoms of a genetic disorder b. segment of a chromosome moves to a nonhomologous chromosome c. extra sets of chromosomes d. gets around e. a chromosome segment lost \(f\) one extra chromosome

Short Answer

Expert verified
Polyploidy: c, Deletion: e, Aneuploidy: f, Translocation: b, Syndrome: a, Transposable element: d.

Step by step solution

01

Match Polyploidy

Polyploidy refers to having extra sets of chromosomes. Therefore, polyploidy matches with option 'c', "extra sets of chromosomes".
02

Match Deletion

Deletion is a type of chromosomal mutation where a segment of a chromosome is lost. So, deletion matches with option 'e', "a chromosome segment lost".
03

Match Aneuploidy

Aneuploidy is a condition where there is an abnormal number of chromosomes, such as one extra chromosome or one missing chromosome. Thus, aneuploidy matches with option 'f', "one extra chromosome".
04

Match Translocation

Translocation involves a segment of a chromosome moving to a nonhomologous chromosome. Therefore, translocation matches with option 'b', "segment of a chromosome moves to a nonhomologous chromosome".
05

Match Syndrome

A syndrome often refers to the collection of symptoms that characterize a genetic disorder. Thus, syndrome matches with option 'a', "symptoms of a genetic disorder".
06

Match Transposable Element

A transposable element is often described as something that "gets around", since it can move from one location to another within the genome. So, transposable element matches with option 'd', "gets around".

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Polyploidy
Polyploidy is a fascinating chromosomal phenomenon where an organism has more than two complete sets of chromosomes. Unlike humans, who are diploid with two sets of chromosomes, some plants and animals can be polyploid.
  • Triploid: Having three sets of chromosomes (3n).
  • Tetraploid: Having four sets of chromosomes (4n).
Polyploidy is common in the plant kingdom and can lead to larger fruit and flowers. It occurs naturally in some species and can also be induced artificially for agricultural advantages. Polyploid organisms often exhibit increased robustness and adaptability. However, being polyploid is less common in animals due to the complexities in reproductive processes linked to the chromosomal distribution.
Aneuploidy
Aneuploidy is a condition characterized by an abnormal number of chromosomes. This can mean having extra chromosomes or missing some.
  • Monosomy: Missing one chromosome from a pair, e.g., Turner syndrome (XO).
  • Trisomy: Having an extra chromosome, such as in Down syndrome, which is trisomy 21.
The causes of aneuploidy often include errors during cell division, where chromosomes are not distributed evenly into daughter cells. These errors can lead to genetic disorders and developmental issues in individuals. In human health, aneuploidy is a significant cause of miscarriage and various syndromes, highlighting its impact on reproductive and developmental biology.
Deletion
Deletion in genetics refers to the loss of a segment of DNA from a chromosome. This can have significant effects on an organism, depending on the genes located in the deleted section.
  • Small Deletions: May affect only a single gene.
  • Large Deletions: Can encompass several genes, potentially leading to serious developmental disorders or diseases.
Deletions can occur spontaneously or due to environmental factors like radiation. Such deletions can lead to conditions such as cri du chat syndrome, which results from a partial deletion on chromosome 5.
Translocation
Translocation is a type of chromosomal rearrangement where a chromosome segment is transferred from one chromosome to another, nonhomologous chromosome. This process can be balanced, where no genetic material is lost, or unbalanced, where some genetic material is gained or lost, potentially leading to developmental issues or genetic disorders.
  • Balanced Translocation: Typically does not lead to health problems, but can affect offspring.
  • Unbalanced Translocation: Can result in genetic syndromes like Down syndrome when involving certain specific chromosomal exchanges.
Translocations can occur naturally or be induced and are significant in studies of genetic diseases and cancer research.
Syndrome
In genetics, a syndrome refers to a group of signs and symptoms that occur together and characterize a particular abnormality or condition. Genetic syndromes result from various chromosomal anomalies, such as duplications, deletions, or mutations, which lead to the distinct set of symptoms observed.
  • Common Genetic Syndromes: Down syndrome, Turner syndrome, and Klinefelter syndrome are some examples.
Syndromes can vary widely in their impact, from mild to severe, depending on the genetic change's nature and extent. They often require tailored medical approaches for management and treatment.
Transposable Elements
Transposable elements, sometimes called "jumping genes," are sequences of DNA that can change position within the genome. This mobility can lead to genetic variation and evolution over time. These elements can disrupt genes and create mutations if they insert themselves into crucial areas of the DNA.
  • Types of Transposable Elements: DNA transposons and retrotransposons, the latter of which move via an RNA intermediate.
  • Role in Evolution: Contribute to genetic diversity and regulatory changes across generations.
Transposable elements make up a significant portion of many organisms' genomes and are crucial in shaping the structure and function of genomes over time.

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Most popular questions from this chapter

A female child inherits one \(\mathrm{X}\) chromosome from her mother and one from her father. What sex chromosome does a male child inherit from each of his parents?

Is this statement true or false? Inheriting three or more of each type of chromosome characteristic of the species results in a condition called polyploidy.

Klinefelter syndrome \((\mathrm{XXY})\) can be easily diagnosed by __________ . a. pedigree analysis b. aneuploidy c. karyotyping d. phenotypic treatment

Constructing a family pedigree is particularly useful when studying inheritance patterns in organisms that ___________ . a. produce many offspring per generation b. produce few offspring per generation c. have a very large chromosome number d. reproduce asexually e. have a fast life cycle

Alleles for Tay-Sachs disease are inherited in an autosomal recessive pattern. Why would two parents with a normal phenotype have a child with Tay-Sachs? a. Both parents are homozygous for a Tay-Sachs allele. b. Both parents are heterozygous for a Tay-Sachs allele. c. A new mutation gave rise to Tay-Sachs in the child. d. \(b\) or \(c\)
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