GENETICS AND EVOLUTION
INHERITANCE AND VARIATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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body height, hair type, heart rate
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blood type, eye colour, fingerprint type
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foot length, tongue rolling ability, hand span
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body mass, eye colour, earlobes attached
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Detailed explanation-1: -Discrete variation is either/or and is often caused by the presence or absence of a small number if genes. For example, our ability to “roll” our tongues is determined by just one gene. We can all either roll our tongue or not-there’s nothing in between.
Detailed explanation-2: -As with many traits, the nature of human eye colour variation is continuous, spanning from the lightest shades of grey or blue to the darkest shades of brown or black4.
Detailed explanation-3: -Fingerprint: This is a type of discontinuous variation whereby each human being has a fingerprint that is specific to that person. This is due to slight variation in the main groups of the fingerprints.
Detailed explanation-4: -Variations mean the differences (morphological, physiological, cytological and behaviouristic) amongst the individuals of the same species and the offspring of the same parents.