- The environment needs to change in order to natural selection to occur.
Reason:
Because, Natural selection is the differential survival and reproduction of individuals due to differences in phenotype. It is a key mechanism of evolution, the change in the heritable traits characteristic of a population over generations.
2. Population has some genetic variations.
Reason:
Genetic variation is essential for natural selection because natural selection can only increase or decrease frequency of alleles that already exist in the population. Genetic variation is caused by:
mutation and random mating between organisms
3. Nature select organism with specific traits to survive and reproduce.
Reason:
According to Charles Darwin's theory of evolution by natural selection, organisms that possess heritable traits that enable them to better adapt to their environment compared with other members of their species will be more likely to survive, reproduce, and pass more of their genes on to the next generation.
Answer:
CRCR × CWCW
Explanation:
Flower color in snapdragons exhibits incomplete dominance wherein the heterozygous genotype exhibits the blend phenotype. To have all the pink-flowered progeny, all the progeny should have CRCW genotype and must obtain CR allele from one parent and CW from the other.
Among the given options, parent genotype "CRCR × CWCW" will give all the pink-flowered progeny. The parent plant with genotype CRCR would produce all the gametes with "CR" alleles while the parent with genotype "CWCW" would produce all the gametes with the "CW" allele. The random fusion of these gametes from the two parents would give all pink-flowered progeny with genotype "CRCW".
<span>The question is providing us with the following scenario:The frog population in the Amazon basin varied. Every 500 years, there was a mutational change leading to speciation. In between, the population remained the same with no observable changes. This pattern of microevolution is called punctuated equilibrium. This pattern is distingushed by long periods of lack of change, followed by a sudden and often extreme change, and followed again by a period of a lack of change. </span>
Answer:
Yes they do
Explanation:
Animals and plants make up a ecosystem because the animals feed off the plants and the animals feed off of other animals.
