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Liula [17]
3 years ago
8

What is biological evolution

Biology
2 answers:
Lina20 [59]3 years ago
6 0
Biological Evolution- is the refers to the cumulative changes that occurs ina population over a time.
Nana76 [90]3 years ago
5 0

Biological evolution is the genetic changes that occur in a population over successive generations. It is a process whereby changes occur on the genetic level of a population and it is being transferred from one generation to another. Biological evolution takes place as a result of natural selection and its result may be minimal (unnoticeable) or significant (noticeable). Biological evolution includes microevolution (minor genetic changes within a specie or population) and macroevolution (large evolutionary changes above the species level).

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8 0
3 years ago
Imagine you do a test cross between a purple-flowered pea plant having serrated leaves (a dominant trait) and a white-flowered p
Rom4ik [11]

Answer:

genes for flower color and edge shape are linked. They do not assort independently.

Explanation:

<u>Available data:</u>

  • test cross between a purple-flowered pea plant having serrated leaves and a white-flowered pea plant having smooth edges.
  • serrated leaves → dominant trait
  • smooth edges → recessive trait
  • purple color → dominant trait
  • white color → recessive trait
  • F1: 4 purple-serrated:1 purple-smooth:1 white-serrated:4 white-smooth.

There are two genes involved in the cross. The expected ratios are 1:1:1:1 because we assume genes assort independently. However, we see a different phenotypic distribution. When phenotypic ratios differ from the expected ones, it means that genes are linked.

To know if two genes are linked in the same chromosome, we must observe the progeny distribution. If individuals, whose genes assort independently, are test crossed, they produce a progeny with equal phenotypic frequencies 1:1:1:1. But if instead of this distribution, we observe a different one, that is that phenotypes appear in different proportions, we can assume that genes are linked in the double heterozygote parent

 

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bixtya [17]
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