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Chromosomes And Recombination Quiz

Most recombination is naturally occurring. During meiosis in eukaryotes, genetic recombination involves the pairing of homologous chromosomes. This may be followed by information transfer between the chromosomes. ... In meiosis and mitosis, recombination occurs between similar molecules of DNA . In the nucleus of each cell, the DNA molecule is packaged into thread-like structures called chromosomes

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Quiz Questions And Answers

What would be the frequency of AABBCC individuals from a mating of two AaBbCc individuals?

1/64
2/34
1/32

The stage of meiosis in which chromosomes pair and cross over is:

metaphase I
prophase I
prophase II

Polyploidy refers to:

extra copies of a gene adjacent to each other on a chromosome
an individual with complete extra sets of chromosomes
a chromosome which has replicated but not divided

A gene showing codominance

has alleles that are recessive to each other
has alleles tightly linked on the same chromosome
has both alleles independently expressed in the heterozygote

Which component of transcribed RNA in eukaryotes is present in the initial transcript but is removed before translation occurs:

Ribosome binding site
Intron
codons coding for the protein to be produced

X-chromosome inactivation

normally takes place in males but not females
occurs in fruit flies but not in mammals
results in genetically turning off one of the two X chromosomes in female mammals

DNA ligase is:

an enzyme that joins fragments in normal DNA replication
an enzyme of bacterial origin which cuts DNA at defined base sequences
an enzyme that facilitates transcription of specific genes

An Hfr strain of E. coli contains:

a bacterial chromosome with a human gene inserted
a bacterial chromosome with a phage inserted
a bacterial chromosome with the F factor inserted

Replication of DNA:

takes place in a “conservative” manner
takes place in a “dispersive” manner
takes place in a “semi-conservative” manner

A duplication is:

loss of genes in part of a chromosome
a reversal of order of genes on a chromosome
an extra copy of the genes on part of a chromosome

A mutation in a codon leads to the substitution of one amino acid with another. What is the name for this type of mutation?

nonsense mutation
frameshift mutation
missense mutation

Tracing of a cell lineage during development means that:

the sequence of the enhancers for developmental genes is known
cell components in the membrane involved in signaling have been isolated
the cells giving rise to and derived from a specific cell are known

Zinc finger proteins and helix-turn-helix proteins are:

c.components of ribosomes
involved in the control of translation
types of DNA-binding proteins

Transcriptional activator proteins:

bind to ribosomes to activate the production of specific proteins
bind regions near a eukaryotic gene and allow an RNA polymerase to transcribe a gene
transcribe a messenger off a DNA template

A homeotic mutation is one which:

is present in only one form in an individual
results in development of a tumor
substitutes one body part for another in development
ANSWERS

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