How did flowers and fruits contribute to angiosperms becoming dominant land plants on earth?

1 answer:

4 0

Answer: The study, by Dr. Tim Brodribb and Dr. Taylor Field of the University of Tasmania and University of Tennessee, used plant physiology to reveal how flowering plants, including crops, were able to dominate land by evolving more efficient hydraulics, or 'leaf plumbing', to increase rates of photosynthesis.

Explanation: The reason for the success of this evolutionary step is that under relatively low atmospheric C02 conditions, like those existing at present, water transport efficiency and photosynthetic performance are tightly linked. Therefore adaptations that increase water transport will enhance maximum photosynthesis, exerting substantial evolutionary leverage over competing species.

The evolution of dense leaf venation in flowering plants, around 140-100 million years ago, was an event with profound significance for the continued evolution of flowering plants. This step provided a 'cretaceous productivity stimulus package' which reverberated across the biosphere and led to these plants playing the fundamental role in the biological and atmospheric functions of the earth.

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How do scientist predict the patterns of heredity?

Nookie1986 [14]

Answer:

The classic tool to predict the patterns of heredity is using a Punnett Square.

Explanation:

In genetics, a trait can be considered dominant or recessive. Since the important discoveries of Gregor Mendel, scientists use a capital letter (D) to indicate a trait is dominant, and a lowcase letter (d) to show a trait is recessive.

Assuming that a scientist knows the genotype for the desired trait they want to predict on the offpsring, a Punnett Square is a reliable tool and a graphic representation that permits them to visualize the potential features of the offspring by showing how the alleles may be exhibited and passed on the offspring and will determine the possible combination of genotypes.

How does it work?

For example, as we can observe in the image below, both parents are homozygous for a trait PP=Purple; pp=white. P is dominant and p is recessive (the color purple will be dominant, and the white will be recessive). So, we put one parent's genotype in the top row (PP) and the other parent's genotype in the left column (pp) and combine one of each letters on the squares, i.e. one of each parent's alleles. Then, we can observe in the results that 3 of the offspring will exhibit the purple color (PP, Pp, Pp) and only one will exhibit the white recessive color (pp); or more properly known as a genotypic ratio of 3:1.

3 0

3 years ago

A brown bird was crossed with a white one and all of the offspring were tan. Complete a Punnett Square analysis for this pair to

Alex73 [517]

Answer:

here.

Explanation:

The genes coding for colour show codominance. Both the brown and white pigment are equally expressed in the phenotype to give the tan colour.

Considering that the allele for brown pigment is CB and that for white pigment is CW, the genotype for the brown bird is CB CB and that for the white bird is CW CW.

Crossing CB CB × CW CW,

100% CB CW - tan-coloured birds

3 0

3 years ago

What is the result of dissociation of water? a) Formation of O-2 ions b) Formation of H+ and OH- ions c) Formation of H- and OH+

kati45 [8]

I think the correct answer from the choices listed above is option C. The result of the dissociation of water is the formation of H- and OH+ ions. This process is reversible which means that it could form back to water. Hope this answers the question. Have a nice day.

4 0

2 years ago

The____

natka813 [3]

b. Cerebrum

and is responsible for the integration of sensory and neural functions.

5 0

2 years ago

Leaves are important plant structures because they?

maksim [4K]

It gives the plant air and food

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2 years ago