829069
Questão 1
Questão
Which type of cell division produces cells with the diploid (2n) number of chromosomes?
Responda
-
Meiosis
-
Mitosis
Questão 2
Questão
Which type of cell division produces cells with the haploid (n) number of chromosomes?
Responda
-
Meiosis
-
Mitosis
Questão 3
Questão
Which type of cell division produces somatic (body) cells?
Responda
-
Meiosis
-
Mitosis
Questão 4
Questão
Which type of cell division produces gametes?
Responda
-
Meiosis
-
Mitosis
Questão 5
Questão
Which type of cell division is used in asexual reproduction and leads to no genetic variation?
Responda
-
Meiosis
-
Mitosis
Questão 6
Questão
Which type of cell division is used in sexual reproduction and leads to genetic variation?
Responda
-
Meiosis
-
Mitosis
Questão 7
Questão
True or false? In order to undergo cell division, the chromosomes in the cell need to be copied.
Responda
- True
- False
Questão 8
Questão
Where would you find totipotent, undifferentiated stem cells?
Responda
-
In zygotes and embryos
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In the microvilli in the small intestine
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In bone marrow
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In the tips of shoots and roots
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In the parietal lobe of the brain
Questão 9
Questão
Why do gametes (sperm and ova) have a haploid (n) number of chromosomes?
Responda
-
They are too small to carry the diploid (2n) number of chromosomes
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When they fuse in fertilisation, the resulting zygote has the correct diploid (2n) number of chromosomes
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Half of the chromosomes are missed out as the gamete is a short-lived cell
Questão 10
Questão
True or false? Research on embryo stem cells is not considered unethical as the embryo is not yet alive.
Responda
- True
- False
Questão 11
Questão
True or false? In 2010, the first organ grown using stem cells was successfully transplanted into a human child.
Responda
- True
- False
Questão 12
Questão
Which scientist came up with the idea of genes but was ignored for many years as DNA had yet to be discovered?
Responda
-
Crick and Watson
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Mendel
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Darwin
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Lamarck
Questão 13
Questão
What does a codon (a sequence of three nucleotide bases) code for?
Responda
-
Nothing
-
A molecule of glucose
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An amino acid
Questão 14
Questão
What is the best definition of a recessive allele?
Responda
-
An allele that is "masked" by the effect of a dominant allele
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An allele that is rarely passed down
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An allele that causes learning difficulties
Questão 15
Questão
What would be the genotype of a person who was homozygous dominant for brown eyes?
Responda
-
BB
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Bb
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bb
Questão 16
Questão
True or false? A person's phenotype is the combination of alleles that they have.
Responda
- True
- False
Questão 17
Questão
What is a Punnet square?
Responda
-
A square number that is 1 less than a prime number, discovered by J W Punnet
-
A biological phenomenon exhibited by ravens which causes them to fly in a square formation
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A grid which shows all possible combinations of alleles and the corresponding phenotype expressed
Questão 18
Questão
Which of these diseases are caused by dominant alleles?
Responda
-
Sickle cell anaemia
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Huntington's disease
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Cystic fibrosis
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Polydactyly
Questão 19
Questão
True or false? Cystic fibrosis causes mucus to become thick and sticky, often leading to problems with breathing, digestion and fertility.
Responda
- True
- False
Questão 20
Questão
True or false? A carrier of cystic fibrosis will have the heterozygous genotype Cc.
Responda
- True
- False
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