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1.1 The study of life Read Online
Viewed from space, Earth offers no clues about the diversity of life forms that reside there. The first forms of life on Earth are thought to have been microorganisms that existed for billions of years in the ocean before plants and animals appeared. The mammals, birds, and flowers so familiar to us are all relatively recent, originating 130 to 200 million years ago. Humans have inhabited this planet for only the last 2.5 million years, and only in the last 200,000 years have humans started looking like we do today.
Chapter 13: Modern Understandings of Inheritance MCQ Multiple Choices Questions Quiz Test Bank
13.1 Chromosomal Theory and Genetic Linkage
13.2 Chromosomal Basis of Inherited Disorders
Download MCQ Quiz PDF eBook
Question: Which recombination frequency corresponds to perfect linkage and violates the law of independent assortment?
Choices:
0
0.25
0.50
0.75
Question: Abnormalities in the number of X chromosomes tends to have milder phenotypic effects than the same abnormalities in autosomes because of ________.
Choices:
deletions
nonhomologous recombination
synapsis
X inactivation
Question: By definition, a pericentric inversion includes the ________.
Choices:
centromere
chiasma
telomere
synapse
Question: X-linked recessive traits in humans (or in Drosophila) are observed ________.
Choices:
in more males than females
in more females than males
in males and females equally
in different distributions depending on the trait
Question: The genotype XXY corresponds to
Choices:
Klinefelter syndrome
Turner syndrome
Triplo-X
Jacob syndrome
Question: Which of the following codes describes position 12 on the long arm of chromosome 13?
Choices:
13p12
13q12
12p13
12q13
Question: Assume a pericentric inversion occurred in one of two homologs prior to meiosis. The other homolog remains normal. During meiosis, what structure-if any-would these homologs assume in order to pair accurately along their lengths?
Choices:
V formation
cruciform
loop
pairing would not be possible
Question: The first suggestion that chromosomes may physically exchange segments came from the microscopic identification of ________.
Choices:
synapsis
sister chromatids
chiasmata
alleles
Question: In agriculture, polyploid crops (like coffee, strawberries, or bananas) tend to produce ________.
Choices:
more uniformity
more variety
larger yields
smaller yields
Question: Which recombination frequency corresponds to independent assortment and the absence of linkage?
Choices:
0
0.25
0.50
0.75
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