Question 1

A maize plant is homozygous for an allele C^m,caused by the insertion of a Ds element into the coding region of a gene (C)that encodes an enzyme necessary for the synthesis of anthocyanin in maize kernels. a)If this plant also contains an Ac element in its genome,what will be the phenotype of its kernels? Justify your answers. b)If this plant does not contain an Ac element,what will be the kernel phenotype? Justify your answers. c)If the plant does not contain an Ac element,but it does contain an autonomous element for another family of transposon,what will be the kernel phenotype? Justify your answers.

Accepted Answer

The answer of A maize plant is homozygous for an...

Question 2

Transposable elements can cause corn kernels to be spotted if they jump in or out of the color genes during the development of the kernel.However,the size of the spots can vary greatly.In words and diagrams,describe the difference between the two kernels shown below at the molecular and developmental levels.

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The answer of Transposable elements can cause corn kernels to...

Question 3

The movement of transposable elements can cause either forward mutations or reversions.
a)Define "forward mutations" and "reversions," and describe the transposition events that cause these two types of phenotypic changes.
b)Why did Barbara McClintock focus on reversions rather than forward mutations when she first studied the inheritance of transposable elements in maize?

Accepted Answer

The answer of The movement of transposable elements can cause...

Question 4

Which of the following statements is/are TRUE about the miniature inverted repeat transposable elements (MITEs)?

Accepted Answer

MITEs are examples of DNA transposons that do not require RNA intermediates for transposition. They are short (~200-500 bp) and found in high copy numbers in many eukaryotic genomes, including humans. Unlike typical transposons, MITEs do not contain genes encoding transposase or any other protein, and rely on the transposase encoded by autonomous DNA transposons for their mobilization.

Question 5

Compare and contrast autonomous and nonautonomous transposable elements.

Accepted Answer

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Question 6

Compare and contrast IS elements,simple transposons,and composite transposons.Use diagrams to help in the comparison.

Accepted Answer

The answer of Compare and contrast IS elements,simple transposons,and composite...

Question 7

Approximately 45 percent of the human genome is derived from transposable elements,such as LINEs and SINEs.
a)What are LINEs and SINEs?
b)How do LINEs differ from SINEs?
c)How is survival possible with this high a percentage of transposable elements in the human genome?

Accepted Answer

The answer of Approximately 45 percent of the human genome...

Question 8

The grasses (such as barley,rice,sorghum,and corn)vary widely in the size of their genomes,yet they are descended from a common ancestor.What accounts for the variation in DNA content (i.e.,the total amount of DNA)?

Accepted Answer

LTR retrotransposons are repetitive DNA sequences that can make up a large proportion of the genome. They are often found in clusters, and their accumulation can lead to an increase in genome size.

Question 9

Match the following transposable elements with the species where it is found.
i.humans (A)Dt element
ii.Drosophila (B)Ty1 element
iii.yeast (C)L1 element
iv.maize (D)P element

Accepted Answer

The answer of Match the following transposable elements with the...

Question 10

a)What is the C-value paradox?
b)What is the explanation for the C-value paradox?

Accepted Answer

The answer of a)What is the C-value paradox?
b)What is the...

Question 11

Which of the following statements is/are FALSE about Tc1 elements found in C.elegans?

Accepted Answer

Tc1 elements are DNA transposons, not retrotransposons. They can transpose in both germ cells and somatic cells, not just in somatic cells. Choices A, C, and D are true statements about Tc1 elements in C.elegans.

Question 12

Match between columns
                        Premises:  humans
 Drosophila
 yeast
 maize

Accepted Answer

The Answer of Dt element and Ty1 element and L1 is...

Quiz 15: The Dynamic Genome: Transposable Elements

Which of the following statements is/are TRUE about the miniature inverted repeat transposable elements (MITEs) ?

Compare and contrast autonomous and nonautonomous transposable elements.

Compare and contrast IS elements,simple transposons,and composite transposons.Use diagrams to help in the comparison.

Approximately 45 percent of the human genome is derived from transposable elements,such as LINEs and SINEs. a)What are LINEs and SINEs? b)How do LINEs differ from SINEs? c)How is survival possible with this high a percentage of transposable elements in the human genome?

The grasses (such as barley,rice,sorghum,and corn) vary widely in the size of their genomes,yet they are descended from a common ancestor.What accounts for the variation in DNA content (i.e.,the total amount of DNA) ?

Match the following transposable elements with the species where it is found. i.humans (A)Dt element ii.Drosophila (B)Ty1 element iii.yeast (C)L1 element iv.maize (D)P element

a)What is the C-value paradox? b)What is the explanation for the C-value paradox?

Which of the following statements is/are FALSE about Tc1 elements found in C.elegans?

Match the following transposable elements with the species where it is found.