https://padlet.com/hglenville/bst3sq10nvjqh6ov en-us 2022-02-23 14:32:12 UTC 2022-03-02 01:59:34 UTC hello@padlet.com turnerduldhardt https://padlet.com/hglenville/bst3sq10nvjqh6ov/wish/2072593403 Embryology is the study of embryos, which is an unborn or unhatched organism at its early age. When studying embryos of fish, mammals, birds, reptiles, humans and more, it becomes evident that these embryos are very similar in structure and characteristics. There are traits of one type of embryo that are shared with another type. This can make them often difficult to tell apart. 

A very controversial idea when presented through Ernest Haeckel's comparative embryology drawings in 1874, it is important to understand that this development does not make humans comparable exactly to fish, chickens or rabbits, but that there are features expressed by embryos of many creatures that are lost over the period of growth. 

An example of this is how both fish and human embryos have gill slits, for fish they turn into gills, for humans they disappear prior to birth. Additionally, the tail in fish embryos becomes its tail, but the tail in human embryos becomes our tailbone. 

This is one way to relate animals through common ancestors, that the most basic type of possible lifeform is similar among many of Earth's creatures. ]]> 2022-03-02 01:32:06 UTC https://padlet.com/hglenville/bst3sq10nvjqh6ov/wish/2072593403 https://padlet.com/hglenville/bst3sq10nvjqh6ov/wish/2072631274 Selective breeding is when humans breed plants and animals for specific traits. It's also called artificial selection. Selective breeding can only happen through human intervention, never naturally. 

The evolutionary process occurs faster during selective breeding than natural selection because the part of the population with the desired trait is the only section actually reproducing and creating the next generation. Therefore, larger changes happen quicker. 

Selective breeding leads to microevolution, which is when evolution occurs on a small scale within a species. This is because selective breeding only applies to one population within a species, and not the whole species itself. 

Examples: 
1. Breeding dogs for herding or racing. 
2. Breeding cows for high milk yield. 
3. Breeding crops for disease resistance. 

Examples of selective breeders are farmers and dog breeders. 

Process of selective breeding: 
1. Breeders notice a variation in the population that shows the trait they desire. 
2. Breeders prevent all plants/animals without the desired trait from reproducing. 
3. Breeders intentionally breed the organisms with the desired trait together, causing the next generation of that population to have an increase prevalence of that trait. 
4. Steps 2 and 3 are repeated to gain more plants/animals with that specific trait. 

A breed is a group of organisms within a species that have specific and similar characteristics. 

The image above shows selective breeding of dogs. Different characteristics of different dog breeds were desired, so they were all selectively bred to express those characteristics only. 
The first dogs were selective bred from docile wolves to become even more docile (then domesticated and eventually able to be trained). Those domesticated dogs were then further bred into specific breeds of dogs with specific traits. 
Because of selective breeding, there are now over 400 breeds of domesticated dogs. 
Today's domestic dogs are all subspecies of the grey wolf. 

Selective breeding is evidence for evolution because it shows that changes can occur within populations and species due to genetic variations between organisms within that population or species. ]]> 2022-03-02 01:59:34 UTC https://padlet.com/hglenville/bst3sq10nvjqh6ov/wish/2072631274