Zadanie 4a
A family carries alternative alleles at a disease-associated locus. Define genotype.
Allele combinations and genotype notation
Distinguish genes from alleles and identify homozygous or heterozygous genotypes.
Tę umiejętność sprawdza 14 zadań wzorowanych na arkuszach IB z lat 2022–2025.
Zadania sprawdzające tę umiejętność: 14 Otwórz w wyszukiwarce z filtrami
Zadanie 4b
A model pedigree concerns a fully penetrant dominant allele D causing a hereditary condition; d does not cause it. Assume no new mutation and no phenocopies. (i) Calculate the probability that individuals1 and2 have an affected child. (ii) Explain why the…
- Materiał graficzny
Zadanie 5c
In a model diploid plant, allele p gives a recessive pale-leaf phenotype and P gives the dominant green-leaf phenotype. Explain why carrying a recessive allele does not always produce its phenotype.
Zadanie 8
Consider connections between biological processes at different levels of organization. (a) Outline how mitosis preserves hereditary information in new cells. (b) Describe the role of DNA variation in speciation. (c) Explain the genetic basis of inheritance…
Zadanie 3a
State every possible genotype of the female in generation I.
- Materiał graficzny
Zadanie 3b
Draw a Punnett grid for the possible children of couple P, using R and r.
- Materiał graficzny
Zadanie 6
A health study considers sickle-cell anaemia in a malaria-endemic region of Uganda. Individuals with two sickle-cell alleles may develop severe anaemia; heterozygotes generally lack that severe phenotype and have some protection against malaria. (a) Outline…
Zadanie 2b
Use a Punnett grid to explain the second-generation flower-colour results.
Zadanie 5b
Deduce why crosses 2 and 3 give different offspring ratios.
Zadanie 5c
Cross 4 produces 96 offspring. Predict the two phenotype counts and the proportion spotted.
Zadanie 16
A hypothetical recessive condition occurs only in individuals with genotype rr. Two unaffected Rr parents already have one affected child. What is the probability that their next child is affected, assuming independent fertilizations? A. Zero B. One quarter C.…
Zadanie 16
A hypothetical recessive condition occurs only in individuals with genotype rr. Two unaffected Rr parents already have one affected child. What is the probability that their next child is affected, assuming independent fertilizations? A. Zero B. One quarter C.…
Zadanie 13
Which description best defines alleles of a gene? A. Alternative versions of that gene with differences in DNA sequence B. Different organelles containing exactly the same protein C. All unrelated genes found on one chromosome D. Proteins that must always give…
Zadanie 13
Two inherited versions of the same gene occupy corresponding loci on homologous chromosomes. What distinguishes these alleles? A. Their nucleotide sequences can differ B. Each must occur on a different chromosome number C. One must be RNA and the other DNA D.…