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