Q. No.Variation in gene frequencies within populations can occur by chance rather than by natural selection.
This is referred to as:
1. Genetic drift
2. Random mating
3. Genetic load
4. Genetic flow
This is referred to as:
Which one of the following options gives one correct example of convergent evolution and divergent evolution?
| Convergent Evolution | Divergent Evolution | |
| 1. | Eyes of octopus and mammals | Bones of forelimbs of vertebrates |
| 2. | Thorns of Bougainvillea and tendrils Cucurbita | Wings of butterflies and birds |
| 3. | Bones of forelimbs of vertebrates | Wings of butterfly and birds |
| 4. | Thorns of Bougainvillea and tendrils of Cucurbita | Eyes of Octopus and mammals |
The extinct human who lived 100000 to 40000 years ago, in Europe, Asia, and parts of Africa, with short stature, heavy eyebrows, retreating for heads, large jaws with heavy teeth, stocky bodies, a lumbering gait, and stooped posture was:
1. Homo habilis
2. Neanderthal human
3. Cro-Magnon humans
4. Ramapithecus
1. Shortening of jaws
2. Binocular vision
3. Increasing brain capacity
4. Upright posture
In the case of peppered moth (Biston betularia), the black-coloured form became dominant over the light-coloured form in England during the industrial revolution. This is an example of:
| 1. | natural selection, whereby the darker forms were selected |
| 2. | appearance of the darker coloured individuals due to very poor sunlight |
| 3. | protective mimicry |
| 4. | inheritance of darker colour character acquired due to the darker environment |
1. adaptive radiation
2. seasonal migration
3. brood parasitism
4. connecting links
1. analogous organs
2. homologous organs
3. vestigial organs
4. retrogressive evolution
Among the human ancestors the brain size was more than 1000 CC in:
1. Homo neaderthalensis
2. Homo erectus
3. Ramapithecus
4. Homo habilis
The concept of chemical evolution is based on:
| 1. | crystallization of chemicals |
| 2. | interaction of water, air, and clay under intense heat |
| 3. | effect of solar radiation on chemicals |
| 4. | possible origin of life by a combination of chemicals under suitable environmental conditions |
| 1. | Thorn of Bougainvillea and tendrils of Cucurbita – Analogous organs |
| 2. | Nictitating membrane and blind spot in the human eye – vestigial organs |
| 3. | Nephridia of the earthworm and Malpighian tubules of cockroach - Excretory organs |
| 4. | Wings of a honey bee and wings of crow - Homologous organs |
© 2024 GoodEd Technologies Pvt. Ltd.