Predicting X-linked haemophilia inheritance

Biologia IBPaper 1A, maj 2026, TZ3wzorowane1 pktzamknięteśrednie (szac.)

Zadanie 20

M carries an X-linked recessive haemophilia allele. N has no copy of that allele. What is the probability that the male T has haemophilia, disregarding new mutations? A. 100% B. 50% C. 0% D. 12.5%

• Materiał graficzny

Biologia IBPaper 1A, listopad 2025, TZ1wzorowane1 pktzamkniętełatwe (szac.)

Zadanie 20

The pedigree concerns an X-linked recessive condition. Let X^N be the unaffected allele and Xⁿ the condition-associated allele. Which genotype or genotypes are possible for Z? A. XⁿXⁿ only B. X^NXⁿ only C. X^NX^N or X^NXⁿ D. X^NX^N or…

• Materiał graficzny

Biologia IBPaper 2, maj 2024, TZ1wzorowane16 pktotwarteśrednie (szac.)

Zadanie 7

(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.

Biologia IBPaper 2, maj 2022, TZ1wzorowane1 pktotwarteśrednie (szac.)

Zadanie 4a

State the probability that P has haemophilia.

• Materiał graficzny

Biologia IBPaper 2, maj 2022, TZ1wzorowane3 pktotwarteśrednie (szac.)

Zadanie 4b

Explain why the females shown do not have haemophilia.

• Materiał graficzny

Biologia IBPaper 2, maj 2022, TZ2wzorowane16 pktotwarteśrednie (szac.)

Zadanie 6

Haemophilia can result from inadequate activity of a blood-clotting protein. (a) Outline how translation produces a polypeptide in a cell. (b) A woman carrying the usual X-linked recessive haemophilia allele has children with a man without that allele.…