GENETICS AND EVOLUTION
INHERITANCE AND VARIATION
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
height
|
|
|
length of foot
|
|
|
tongue rolling
|
|
|
weight
|
Detailed explanation-1: -The ability to roll the tongue, and blood groups, are examples of discontinuous variation.
Detailed explanation-2: -Human blood group is an example of discontinuous variation. In the ABO blood group system, only four blood groups are possible (A, B, AB or O). There are no values in between, so this is discontinuous variation.
Detailed explanation-3: -Which are examples of discontinuous variation? Discontinuous: Eye colour, handedness & lobed/lobeless ears. Continuous: Hand span, arm length & height.
Detailed explanation-4: -Definitions. Discontinuous traits-traits with only a few possible phenotypes that fall into discrete classes; phenotype is controlled by one or only a few genes (ex.: tall or short pea plants; red, pink or white snapdragon flowers)
Detailed explanation-5: -Continuous variation results in a range of phenotypes between two extremes e.g. weight and height in humans. Discontinuous variation results in a limited number of phenotypes with no intermediates but instead distinct groups e.g. ability to roll your tongue.