Updated 2025 AQA AS BIOLOGY 7401 Study Guide: Actual Exam Questions
with Verified Answers, Detailed Rationales, and 100% Accuracy – Guaranteed
Pass | Graded A+ | Complete Questions & Correct Detailed Answers | Brand New!!
What is meant by a hierarchy - (answersA hierarchy is groups within groups with no overlap
between the groups.
Explain the role of independent segregation in meiosis - (answersTo provide genetic variation, to
allow different combinations of maternal and paternral alleles. to produce haploid cells and to
allow homologous chromosomes to separate
How can we tell if a hybrid animal请您
is infertile - (answersThey have an odd number of
chromosomes, this means that the chromosome number cannot be halved, meiosis cannot and
haploid cells cannot be produced.
What is selective breeding - (answersSelective breedings is where humans breed organisms with
chosen alleles.
What problems might arise from selective breeding ? - (answersInbreeding occurs, so there is a
higher probability of mutations being passed on and recessive alleles being expressed. 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.
Explain the advantage of this shift. - (answersThere is a lower affinity for oxygen and so oxygen
unloads more readily to muscles, tissues and cells for rapid respiration.
What are some adaptations for living in a cold environment. - (answersSmall surface area to
volume ratio, this reduces heat loss.
with Verified Answers, Detailed Rationales, and 100% Accuracy – Guaranteed
Pass | Graded A+ | Complete Questions & Correct Detailed Answers | Brand New!!
What is meant by a hierarchy - (answersA hierarchy is groups within groups with no overlap
between the groups.
Explain the role of independent segregation in meiosis - (answersTo provide genetic variation, to
allow different combinations of maternal and paternral alleles. to produce haploid cells and to
allow homologous chromosomes to separate
How can we tell if a hybrid animal请您
is infertile - (answersThey have an odd number of
chromosomes, this means that the chromosome number cannot be halved, meiosis cannot and
haploid cells cannot be produced.
What is selective breeding - (answersSelective breedings is where humans breed organisms with
chosen alleles.
What problems might arise from selective breeding ? - (answersInbreeding occurs, so there is a
higher probability of mutations being passed on and recessive alleles being expressed. 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.
Explain the advantage of this shift. - (answersThere is a lower affinity for oxygen and so oxygen
unloads more readily to muscles, tissues and cells for rapid respiration.
What are some adaptations for living in a cold environment. - (answersSmall surface area to
volume ratio, this reduces heat loss.
