Three of the following are evidence that charophytes are the...

Three of the following are evidence that charophytes are the closest algal relatives of plants. Select the exception. \begin{equation} \begin{array}{l}{\text { (A) similar sperm structure }} \\ {\text { (B) the presence of chloroplasts }} \\ {\text { (C) similarities in cell wall formation during cell }} \\ {\text { division }} \\ {\text { (D) genetic similarities in chloroplasts }}\end{array} \end{equation}

Three of the following are evidence that
charophytes are the closest algal relatives of
plants. Select the exception.
\begin{equation}
\begin{array}{l}{\text { (A) similar sperm structure }} \\ {\text { (B) the presence of chloroplasts }} \\ {\text { (C) similarities in cell wall formation during cell }} \\ {\text { division }} \\ {\text { (D) genetic similarities in chloroplasts }}\end{array}
\end{equation}

Key Concepts

Chloroplast Genomics

This area focuses on the genetic similarities and differences within chloroplast DNA among organisms. Detailed comparisons of chloroplast genomes can provide strong molecular evidence for evolutionary links and help clarify the relationships between various photosynthetic lineages.

Cell Division and Cell Wall Formation

This involves examining the processes by which cells divide and develop their cell walls. Similar mechanisms of cell wall formation during division in different groups can serve as evidence for evolutionary relationships, as these shared features often reflect common ancestry.

Comparative Morphology

This concept refers to the study and comparison of physical structures among organisms. In an evolutionary context, similarities in reproductive structures like sperm indicate a shared evolutionary history, supporting the idea that certain algae are closely related to land plants.

Phylogenetic Analysis

This concept involves comparing organisms based on both morphological and molecular characteristics to determine their evolutionary relationships. It includes analyzing traits such as structure, genetics, and reproductive features to build a family tree that reveals common ancestry and divergence over time.

Transcript

00:01 Okay, so the question today is three of the following are evidence that cerofites are the closest algal relatives of plants.

00:13 Select the exception.

00:15 So we're talking about fites, and the first answer is similar sperm structure.

00:31 So if you remember what we learned about cairophytes, they have flagellated.

00:37 Sperm and in species of plants that do have flagellated sperm which is not all land plants the structure of the sperm does closely resemble the carophyte the structure of caraphyte sperm so in that case this is this is true so i'm sort of treating this like a multiple true false question if we look at answer b this is about the presence of chloroplasts and carrophides do indeed have chloroplast, as do plants as we know.

01:17 However, the simple presence of chloroplast is not necessarily evidence of evolution.

01:24 So many things have chloroplasts all the way back to cyanobacteria, for example, and many different types of algae.

01:33 So while it's true that carophytes do have chloroplast and so do plants, this is not necessarily indicative of evolution.

01:44 So it doesn't in that case provide evidence.

01:50 How about answer c? answer c is similarities in cell wall formation.

02:05 So if you remember back to when we learned about k -rophites, during cell division, they use these special cellulose synthesizing proteins, and there are a couple different types of these.

02:19 So some algae use like linear proteins to synthesize cellulose, but the kerophytes have these distinctive circular protein rings that also match what exists in those plants.

02:35 So that is in fact evidence of evolution because they're so similar...

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