Genetics Recap

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Transcript of Genetics Recap

Draw a chart to depict a monohybrid cross between a homozygous red floweredpea plant and a homozygous white flowered pea plant. State the phenotypic andgenotypic ratios of this cross.

Draw a chart to depict a dihybrid cross between a homozygous red flowered andtall pea plant and a homozygous white flowered and dwarf pea plant. State thephenotypic and genotypic ratios of this cross.

1. Law of DominanceOut of a pair of contrasting characters present together, only one is able to express itself while the other remains suppressed.

2. Law of Segregation(Also called ‘Law of Purity of Gametes’) The two members of a pair of factors separate during the formation of gametes.

3. Law of Independent AssortmentWhen there are two pairs of contrasting characters, the distribution of the members of one pair into the gametes is independent of the distribution of the other pair.

Two brown rabbits were crossed, and they produced 3 brown and 2 white rabbits. Draw a chart to depict this cross.

a. Which trait is dominant – brown or white? Explain.b. What is the genotype of the parents?c. In terms of a percentage, what is the possibility of white rabbits being

produced from this cross?

Draw a chart to depict sex determination in humans.

Depict a cross between a male who suffers from colour blindness and a femalewho is normal.