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Download Support worksheet – Chapter 4 - Cambridge Resources for the IB
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Cambridge Biology for the IB Diploma Support worksheet – Chapter 4 1 The table below compares the processes of mitosis and meiosis. Place a tick () in the box if the description applies to the process or a cross () if it does not. (7) Description of process Mitosis Meiosis involves two nuclear divisions occurs in a haploid cell involves the formation of chiasmata leads to random assortment of chromosomes occurs during gamete formation in animals daughter nuclei have identical genetic content DNA replicates before cell division 2 Assume that in humans the allele for brown eyes (B) is dominant over the allele for blue eyes (b). A blue-eyed man, both of whose parents had brown eyes, marries a brown-eyed woman. They have one child who has blue eyes. What are the genotypes of the man, his parents, his wife and the child? 3 (5) Alkaptonuria is a rare, autosomal genetic condition in humans that affects the metabolism of phenylalanine. The family tree below shows a family who are affected by this condition. a Is alkaptonuria a dominant or recessive condition? b Which individuals in the family are definitely heterozygous for the alkaptonuria allele? (2) c Alkaptonuria occurs as a result of a point mutation. Outline what this term means and give another example of a condition that is caused by a point mutation. (2) Copyright Cambridge University Press 2011. All rights reserved. (1) Page 1 of 2 Cambridge Biology for the IB Diploma 4 Hemophilia is an example of a condition that is sex-linked. A woman who is a carrier for hemophilia and a man who does not have the condition have two children, a boy and a girl. Complete the Punnett grids below using the correct notation to show the inheritance of the condition and the probability of: a their son b their daughter having the condition or being a carrier of it. Son’s alleles Daughter’s alleles Mother Father Father Mother 5 (4) The diagram below shows DNA profiles for a paternity test and for a forensic investigation. a Which of the two alleged fathers is the father of the child? (1) b i Is suspect 1 or suspect 2 more likely to be implicated in the crime? (1) ii Why was a sample of the victim’s DNA taken in this case? (1) Copyright Cambridge University Press 2011. All rights reserved. Page 2 of 2