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nataly862011 [7]
3 years ago
6

Cacti are native to deserts in the Americas, whereas cactus-like euphorbs are native to African deserts. The two plant groups ar

e not closely related, and the euphorbs have normal broad-leaved plants such as the Christmas poinsettia in their ancestry. The most likely explanation for the similarity of some euphorbs to cacti is __________.
Biology
1 answer:
REY [17]3 years ago
5 0

Answer: Convergent evolution

Explanation:

The convergent evolution is a process by which the unrelated or not closely related organisms independently evolve with same traits as a result of being exposed to the same kind of environment or having the same ecological niches. These organisms are linked due to common ancestry.

The given situation is the example of convergent evolution, this is because of the fact that both species (Cacti and cactus-like euphorbs) are native plants of different countries. These species are not closely related but they are sharing common ancestral characteristic with Christmas poinsettia.

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Answer:

In order to find out the genotype we do a testcross of green pea pods with yellow pea pods.

Explanation:

1. If the F1 generation consist of green pea pods only then the genotype of the green pea pod is 'GG' (i.e the dominant alleles).  

<h2>                           TEST CROSS </h2>

                    Green pea pods        X           Yellow pea pods

                                    GG              X              gg

       <u>Gametes: </u>

                                     G               X                g

      <u> F1 Generation: </u>

<h2>                                 Gg </h2>

2. However if the F1 generation consist of 50% green pea pods and 50% yellow pea pods then the genotype of green pea pods is 'Gg' (both the dominant and recessive alleles).

                   Green pea pods        X           Yellow pea pods

                               Gg                  X               gg

       <u>Gametes: </u>

                           G      g      X        g

       <u>F1 Generation:</u>

<h2>                              Gg, gg </h2>

We can relate this to Mendel's Law of segregation and meiosis as

  • Both the alleles segregate into seperate gametes (i.e they are sorted independent of one another).
  • This segregation is similar to the first division of meiosis in which homologous chromosomes of gene are segregated in daughter nuclei
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