particular, the origin of eukaryotes (LECA = Last Eukaryotic Common Ancestor). Bacteria Archaea Time Estimate Range Calibration Point Range LECA | 1173 (718-1455)
Evolution
The history and science of origin and evolution comprise two events, the beginning of life and expansion of life. Our earth originated about 4.5 billion years ago. The term evolution is derived from two Latin words and means the act of unfolding or unrolling. English philosopher Herbert Spencer first used it. Evolution is defined as the change in heritable traits of biological populations over successive generations. These traits are the manifestations of genes that are passed down from parent to offspring during reproduction.
Cladistics
Cladistics is a technique in the classification of organisms, where they are grouped into different clades. The proof for the relationships that are hypothesized is based on the shared derived characteristics known as synapomorphies. These characteristics do not exist in many of the distant ancestors and groups. The common ancestor along with its descendants is considered to be a part of the clade. The rate of closeness is directly proportional to the cladistic grouping and is useful in analyzing the evolutionary mechanism.
Outgroups
Outgroups are significant in studying cladistics or phylogenetics (that describe the evolutionary relationship between different organisms). Further, it is also important to understand the differences and similarities between different organisms.
Taxonomy
It is the branch of biology that works with the identification of organisms at first, then naming, and classification of them into phenetic or phylogenetic groups (a classification system). In other words, it is the scientific study of biological diversity and a part of systematic biology.
Phylogenetics
Phylogenetics is the scientific study of how various groups of organisms are related at the evolutionary level. It finds the relationship between various organisms based on their evolutionary similarities and differences. It is a part of the taxonomy. Although the taxonomic study is not only concerned about phylogeny but taxonomic studies are also concerned about the classification and nomenclature of the different individuals from different taxon.
Phylogeny question
![Refer to the following diagram in answering the questions for this section on origin of life, in
particular, the origin of eukaryotes (LECA = Last Eukaryotic Common Ancestor).
Time Estimate
Range
Bacteria
Archaea
Calibration
Point Range
LECA
| 1173 (718-1455)
| 1100-1200
Red Algae
1006 (631-1279)
Opisthokonta
430-450
646 (410-863)
Embryophytes
329 (224-349)
310-370
250-260
(Ag-Dm)
(Gg-Hs)
Bilateria
Fungi
Red Algae Bryophyta Angiosperms
10. Where do humans map to on this diagram?
B) ẩungi
C) bryophyta
A) bilateria
D) opisthokonta
11. Are humans more related to fungi or plants?
B) plants
C) neither, or both equally
A) fungi
12. Are humans more related to the bryophyta or angiosperms?
A) fungi
C) neither, or both equally
B) plants](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F601f508a-0bcd-4a66-9c32-aa296e04780d%2F7d52fe6b-35ad-46f9-a3b2-51fced057659%2Fadsas5i_processed.png&w=3840&q=75)
![6. (top or bottom) Species A, B, C, D, and, E are all extant species (living today; not to be confused
with "extinct" species). Consider the common ancestor shared between humans and species A
(ancestor A-H), the common ancestor between species B and humans (ancestor B-H), etc. Which of the
two trees below best represents the phylogenetic relationship between species shown in the nucleotide
divergence plot above (top tree or bottom tree)?
A
B
CD E
humans
E-H
Сн/ D-H
В-н
А-Н
E
D
с в А
humans
A-H
C-H / B-H
D-H
E-H](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F601f508a-0bcd-4a66-9c32-aa296e04780d%2F7d52fe6b-35ad-46f9-a3b2-51fced057659%2Fmpetvdk_processed.png&w=3840&q=75)
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