Sex determination. We can use a genetic diagram to show how sex (gender) can be determined. The diagram shows how there is an equal chance that each baby will be a girl or a boy. Click to advance the diagram.
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When constructing a genetic diagram for a monohybrid cross, it is important to follow these conventions:
Show the characteristic of the parents (phenotype).
Show the alleles present in the parents’ cells (genotypes).
Use upper case letters to represent a dominant allele.
Use the lower case version of the same letter to show a recessive allele.
Put gametes in circles.
Show all the different possible combinations of alleles at fertilization.
Put an ‘x’ to show a cross (mating).
Below is an example of how you might construct a genetic diagram to explain a monohybrid cross between a father who has two alleles for free earlobes and a mother who has two alleles for attached earlobes. Which conventions of drawing genetic diagrams do you recognize?
Offsprings’ characteristics: all have free earlobes but have one dominant and one recessive allele