Zadanie 7, Paper 2, maj 2024, TZ1, Biologia IB SL
Wzorowane na: Biology SL Paper 2, May 2024, TZ1, pytanie 7. Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Zadanie
Polecenie
(a) Describe the role of mRNA in polypeptide synthesis.
(b) Describe why haemophilia is more frequent in males than females.
(c) Explain how changes in chromosomes can contribute to evolution.
Korepetytor AI
Nie wiesz, jak ruszyć? Korepetytor zna to zadanie i poprowadzi Cię krok po kroku, bez gotowca.
3 rozmowy · bez karty · Zaloguj się
Sprawdź się
Odpowiedz i oceń, jak poszło. Klucz odsłoń dopiero, gdy masz swoją odpowiedź.
Jak poszło Ci z tym zadaniem?
Wybierz ocenę: zapamięta ją ta przeglądarka, a z darmowym kontem zobaczysz ją na każdym urządzeniu.
Pokaż rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
(a)
mRNA is transcribed from a DNA template. ✔
It is used in translation at ribosomes. ✔
Its sequence determines the polypeptide amino-acid sequence. ✔
Each three-base codon specifies an amino acid. ✔
mRNA codons pair with complementary tRNA anticodons during translation. ✔
(b)
The gene is on the X chromosome or is sex-linked. ✔
The condition is caused by a recessive allele. ✔
Typical males have one X chromosome (XY). ✔
One condition-causing allele on that X is enough for a male to show the condition. ✔
Typical females have two X chromosomes (XX). ✔
A female usually needs the condition-causing allele on both X chromosomes. ✔
A heterozygous female can carry the allele without showing the condition. ✔
(c)
Evolution by natural selection requires heritable variation. ✔
Mutations in chromosomal DNA can generate variation. ✔
Mutation can produce new alleles or DNA sequences. ✔
Crossing over creates new combinations during meiosis. ✔
Random orientation of homologous chromosomes adds variation. ✔
Random fusion of gametes adds variation. ✔
Sexual reproduction produces genetically varied offspring. ✔
Offspring can have phenotypes different from those of their parents. ✔
Some variants confer a selective advantage. ✔
Those individuals are more likely to survive and reproduce or transmit their traits. ✔
Over generations, favoured inherited traits become more frequent. ✔
Quality of communication: clear on first reading, concise and without unnecessary repetition or irrelevant material. ✔
Schemat punktowania
Part (a): any 3 points, maximum 3. Part (b): any 5 points, maximum 5. Part (c): any 7 points, maximum 7. Award 1 independent communication mark. Maximum 16. Accept equivalent wording and relevant diagrams. In part (c), accept converse statements: less favourable variants reduce survival or reproduction and become less frequent.