Gempur Bio Blog!: Sample Qs-Essay

Saturday, November 13, 2010

Sample Qs-Essay

Another good Qs from Trengganu Trial to consider !

[ 10 marks]

[10 marks]

Answer (a)

F1: Diagram 9(a) / height is a continuous variation

P1: the graph is a bell-shape curve / normal distribution

P2: quantitative / its features can be measured

P3: there are intermediate characteristic

P4: have no distinct categories // have complete range of measurement among the boys

P5: influenced by environmental conditions // causes by environmental and genetic factor // cannot be inherited

P6: controlled by two or more genes [Any 5 / Max 5 marks]

F2: Diagram 9(b) / fingerprint pattern is a discontinuous variation

P7: the graph shows discrete distribution / separate bar column

P8: qualitative / characteristic cannot be measured

P9: there is no intermediate pattern

P10: each pattern is distinctively different

P11: not be influenced by environmental factors / caused by genetic factors only / can be inherited

P12: controlled by one gene [Any 5 / Max 5 marks]

(b) Able to describe how the variation occurs in that species of fish.

P1: the variation take place causes by genetic factors

P2: genetic factors are crossing over, independent assortment (of chromosome), random fertilization and mutation

Crossing over

P3: occurs during prophase I of meiosis

P4: segments of chromatids exchange places / segment of maternal chromatid attaches to paternal chromatid

P5: creates a new combination of genes

P6: a gamete (with various combination of genes) produce when chromatid separate during anaphase II

Independent assortment of chromosome

P7: at metaphase I, homologous pair of chromosome are arranged on the equatorial plate / metaphase plate at random

P8: chromosome (inherited) from the father / mother may pass into the same / different gamete

P9: (some of the ) gamete may have the paternal / maternal genotype

P10: (other) may have different combinations of the paternal and maternal genotype

Random fertilisation

P11: Haploid gamete fertilize / fuse randomly with another different haploid gamete

P12: Form diploid zygote with a new combination of genes / different genetic composition

Mutation

P13: Changes in DNA (due to mutation) produce new genes

P14: Two type of mutation : chromosomal mutation and gene mutation [ 10 max]

Reject : environmental factors because is not be inherited

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Study Tips :)