CISI Exam Sample Paper | Questions with 100%
Correct ANSWERs | Updated & Verified
1.What is meant by a hierarchy – ANSWER A hierarchy is groups within groups with no
overlap between the groups
2.Explain the role of independent segregation in meiosis – ANSWER To provide genetic
variation, to allow different combinations of maternal and paternral alleles.
3.To produce haploid cells and to allow homologous chromosomes to separateHow
can we tell if a hybrid animal is infertile – ANSWER They have an odd number of
chromosomes, this means that the chromosome number cannot be halved, meiosis
cannot and haploid cells cannot be produced.
4.What is selective breeding – ANSWER Selective breedings is where humans breed
organisms with chosen alleles.
5.What problems might arise from selective breeding ? – ANSWER Inbreeding occurs,
so there is a higher probability of mutations being passed on and recessive alleles being
expressed.
6.Selective breeding reduces genetic variation, meaning that there is a smaller gene
pool, so animals that are produced from selective breeding can be killed by the same
disease, it also reduces the ability to adapt and therefore survive in the future if there
are any drastic environmental changes.
The oxygen dissociation curve for haemoglobin shifts to the right during vigorous
exercise.
7. Explain the advantage of this shift. – ANSWER There is a lower affinity for oxygen
and so oxygen unloads more readily to muscles, tissues and cells for rapid respiration.
8.What are some adaptations for living in a cold environment. - ANSWERSmall surface
area to volume ratio, this reduces heat loss.
9.Describe and explain how the countercurrent system leads to efficient gas exchange
across the gills of a fish – ANSWER Water and blood flow in opposite directions, this
maintains a concentration gradient, meaning that an equilibrium is not reached, water is
always next to blood with a lower concentration of oxygen along the whole
length of the lamellaeAmoebic gill disease is caused by a parasite that lives on the gills
of some species of fish.
10.The disease causes the lamellae to become thicker and to fuse together. How does
this reduce the efficiency of gas exchange in fish. - ANSWER1. The thicker lamellae,
means that there is a greater diffusion distance.
2. The fused lamellae meaning that there is a reduced surface area
Correct ANSWERs | Updated & Verified
1.What is meant by a hierarchy – ANSWER A hierarchy is groups within groups with no
overlap between the groups
2.Explain the role of independent segregation in meiosis – ANSWER To provide genetic
variation, to allow different combinations of maternal and paternral alleles.
3.To produce haploid cells and to allow homologous chromosomes to separateHow
can we tell if a hybrid animal is infertile – ANSWER They have an odd number of
chromosomes, this means that the chromosome number cannot be halved, meiosis
cannot and haploid cells cannot be produced.
4.What is selective breeding – ANSWER Selective breedings is where humans breed
organisms with chosen alleles.
5.What problems might arise from selective breeding ? – ANSWER Inbreeding occurs,
so there is a higher probability of mutations being passed on and recessive alleles being
expressed.
6.Selective breeding reduces genetic variation, meaning that there is a smaller gene
pool, so animals that are produced from selective breeding can be killed by the same
disease, it also reduces the ability to adapt and therefore survive in the future if there
are any drastic environmental changes.
The oxygen dissociation curve for haemoglobin shifts to the right during vigorous
exercise.
7. Explain the advantage of this shift. – ANSWER There is a lower affinity for oxygen
and so oxygen unloads more readily to muscles, tissues and cells for rapid respiration.
8.What are some adaptations for living in a cold environment. - ANSWERSmall surface
area to volume ratio, this reduces heat loss.
9.Describe and explain how the countercurrent system leads to efficient gas exchange
across the gills of a fish – ANSWER Water and blood flow in opposite directions, this
maintains a concentration gradient, meaning that an equilibrium is not reached, water is
always next to blood with a lower concentration of oxygen along the whole
length of the lamellaeAmoebic gill disease is caused by a parasite that lives on the gills
of some species of fish.
10.The disease causes the lamellae to become thicker and to fuse together. How does
this reduce the efficiency of gas exchange in fish. - ANSWER1. The thicker lamellae,
means that there is a greater diffusion distance.
2. The fused lamellae meaning that there is a reduced surface area
