3022146
Descripción
Test por janellenaidoo, actualizado hace más de 1 año
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Creado por janellenaidoo
hace más de 9 años
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Pregunta 1
Pregunta
Which ONE of the following is the best definition of a species?
Respuesta
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A population of similar animals which can interbreed.
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A population of organisms which can breed to produce fertile offspring.
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A community of organisms which can interbreed.
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A population of organisms with similar characteristics.
Pregunta 2
Pregunta
What causes the genetic disorder where some males have the sex chromosomes XXY?
Respuesta
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A sex-linked recessive allele.
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Non-disjunction of chromosomes during meiosis.
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Two sperm cells fertilise one ovum.
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Crossing-over during meiosis.
Pregunta 3
Pregunta
The chromosome complement of a human individual who inherits an X chromosome from the father, is ...
Respuesta
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44 and XX.
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44 and XY.
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46 and XX.
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46 and XY.
Pregunta 4
Pregunta
Which ONE of the following is an example of artificial selection?
Respuesta
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DDT resistance in mosquitoes.
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The development of different species of tortoise from a common ancestor.
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The decreasing effect of antibiotics on bacteria.
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Breeding dairy cattle to increase milk production.
Pregunta 5
Pregunta
What percentage of adenine bases is present in a DNA molecule with 2 000 bases, if 400 of the bases are cytosine?
Respuesta
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20%
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30%
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40%
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60%
Pregunta 6
Pregunta
Two parents both have blood group A. Their child has blood group O. What is the best explanation for this pattern of inheritance?
Respuesta
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The child has inherited the blood group directly from a grandparent.
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The parents are homozygous for the blood group alleles.
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The parents are heterozygous for the blood group alleles.
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There has been a mutation in the blood group alleles.
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