Predict phenotypes from allele combinations under complete dominance and explain the heterozygote result.
Tę umiejętność sprawdza 15 zadań wzorowanych na arkuszach IB z lat 2022–2025.
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…
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.
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…
State every possible genotype of the female in generation I.
Draw a Punnett grid for the possible children of couple P, using R and r.
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…
Use a Punnett grid to explain the second-generation flower-colour results.
Explain the inheritance conclusion supported by cross 1.
Deduce why crosses 2 and 3 give different offspring ratios.
Cross 4 produces 96 offspring. Predict the two phenotype counts and the proportion spotted.
A hypothetical condition is caused by a fully penetrant autosomal dominant allele. The pedigree shows one family; assume no new mutations. What is the probability that the next child of II-2 and II-3 will be affected? A. 0% B. 25% C. 75% D. 50%
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.…
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.…
This pedigree shows a fully penetrant inherited condition. Assume no new mutations. Which pattern fits it? A. Autosomal dominant inheritance B. Y-linked inheritance C. X-linked dominant inheritance D. Autosomal recessive inheritance
A fully penetrant autosomal dominant condition is caused by allele D. Two heterozygous parents are Dd. What is the chance that a child inherits the condition? A. One quarter B. One half C. Three quarters D. All children
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