Learning Objectives
You should be able to:
(a) define a gene as a unit of inheritance and distinguish clearly between the terms gene and allele
(b) describe the difference between continuous and discontinuous variation and give examples of each
(c) explain the terms dominant, recessive, homozygous, heterozygous, phenotype and genotype
(d) predict the results of simple crosses with expected ratios of 3:1 and 1:1, using the terms homozygous, heterozygous, F1 generation and F2 generation
(e) state why observed ratios often differ from expected ratios, especially when there are small numbers of progeny
(f) describe the determination of sex in humans – XX and XY chromosomes
(g) describe mutation as a change in the structure of a gene such as in sickle cell anaemia, or in the chromosome number such as the 47 chromosomes in a condition known as Down’s Syndrome
(h) name radiation and chemicals as factors which may increase the rate of mutation
(a) define a gene as a unit of inheritance and distinguish clearly between the terms gene and allele
(b) describe the difference between continuous and discontinuous variation and give examples of each
(c) explain the terms dominant, recessive, homozygous, heterozygous, phenotype and genotype
(d) predict the results of simple crosses with expected ratios of 3:1 and 1:1, using the terms homozygous, heterozygous, F1 generation and F2 generation
(e) state why observed ratios often differ from expected ratios, especially when there are small numbers of progeny
(f) describe the determination of sex in humans – XX and XY chromosomes
(g) describe mutation as a change in the structure of a gene such as in sickle cell anaemia, or in the chromosome number such as the 47 chromosomes in a condition known as Down’s Syndrome
(h) name radiation and chemicals as factors which may increase the rate of mutation
Home-Based Research
Self-CheckCheck your understanding in this simple quiz HERE.
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Lesson Slides
No slides will be uploaded for this chapter. Will go through Bio notes during class time.