3022146
Description
Quiz by janellenaidoo, updated more than 1 year ago
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Created by janellenaidoo
almost 9 years ago
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Question 1
Question
Which ONE of the following is the best definition of a species?
Answer
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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.
Question 2
Question
What causes the genetic disorder where some males have the sex chromosomes XXY?
Answer
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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.
Question 3
Question
The chromosome complement of a human individual who inherits an X chromosome from the father, is ...
Answer
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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.
Question 4
Question
Which ONE of the following is an example of artificial selection?
Answer
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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.
Question 5
Question
What percentage of adenine bases is present in a DNA molecule with 2 000 bases, if 400 of the bases are cytosine?
Answer
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20%
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30%
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40%
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60%
Question 6
Question
Two parents both have blood group A. Their child has blood group O. What is the best explanation for this pattern of inheritance?
Answer
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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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