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just olya [345]
4 years ago
8

Can toads are large, nonnative, poisonous toads in australia. after cane toads entered australia, scientists observed that the a

verage head size in a population of toad- eating snakes was getting smaller. snakes with smaller heads are not able to eat the large cane toads. what is this an example of?
A. directional selection

B. biodiversity

C. speciation

D. disruptive selection
Biology
2 answers:
S_A_V [24]4 years ago
6 0
Directional selection I'm pretty sure hope it helps!
Lostsunrise [7]4 years ago
6 0

This an example of directional selection

Directional selection is a type of natural selection whereby the observable traits (phenotype) such as skin color of a population evolves toward one end of a trait rather than the mean phenotype, or the opposite extreme phenotype. Directional selection usually occurs in environments that have changed over periods of time. Directional selection is caused by certain factors such as climate, weather changes, or food availability.

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FrozenT [24]

Answer:

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Explanation:

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3 years ago
At the end of meiosis i, there are two haploid cells, each with two sister chromatids per chromosome. True or false?.
jok3333 [9.3K]

True.

At the end of meiosis I, there are two haploid cells.

<h3>What is the process of meiosis I?</h3>

Meiosis I refers to the initial nuclear division that takes place when gametes are formed. Due to the fact that the resulting cells have half as many chromosomes as the parent cell, it is also referred to as the reduction division. Prophase I, Metaphase I, Anaphase I, and Telophase I are the four phases that make up Meiosis I.

Prophase I:

The chromosomes condense during prophase I and become apparent inside the nucleus. Following this chromosomal condensation, each chromosome pair's members align adjacent to one another and are referred to as homologous chromosomes because of their identical size and gene content.

At this stage, a mechanism known as synaptic attachment occurs between the two chromosomes in each pair along their lengths. Then, while the homologous chromosomes are tightly coupled, the individuals within each pair cross over, also known as recombination, to exchange neighboring pieces of DNA. The nuclear membrane eventually starts to deteriorate after the conclusion of prophase I.

Metaphase I:

Microtubules leave the spindle at the beginning of metaphase I and join the kinetochore close to the centromere of each chromosome. In specifically, microtubules from one spindle side bind to one chromosome while those from the other spindle side adhere to the other chromosome in each homologous pair. The chromosomal pairs subsequently align themselves along the equator of the cell, forming the metaphase plate, with the assistance of these microtubules.

Anaphase I:

The homologous chromosomes are separated during anaphase I by the disintegration and contraction of the microtubules, which causes the two chromosomes in each pair to be drawn toward the opposite ends of the cell. Because of this division, each daughter cell that emerges from meiosis I will have half as many chromosomes following interphase as the original parent cell. Additionally, each chromosome's sister chromatid still has a connection.

Telophase I:

In telophase I, the cytoplasm organizes and separates into two as the new chromosomes approach the spindle. Now there are two cells, and each one has half as many chromosomes as its parent cell did. The recombination that took place during prophase I also caused the two daughter cells to not be genetically identical to one another.

Learn more about meiosis I here:

brainly.com/question/2095046

#SPJ4

6 0
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luda_lava [24]
Glycolysis produces pyruvate molecules, , and ATP. The pyruvate molecules undergo reactions that convert the three carbon pyruvate to a two carbon acetyl CoA and an one carbon carbon dioxide. The acetyl-CoA molecules are then used as the initial inputs for the citric acid cycle, as they are combined with oxaloacetate.
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