44. Genetic variation. Phenotype variations - modifications.

Question 1

Genetic variation:

Recombination - is a process by which pieces of DNA are broken and recombined to produce new combinations of alleles. This recombination process creates genetic diversity at the level of genes that reflects differences in the DNA sequences of different organisms.

Answer 1

Genetic variation:

Recombination - is a process by which pieces of DNA are broken and recombined to produce new combinations of alleles. This recombination process creates genetic diversity at the level of genes that reflects differences in the DNA sequences of different organisms.

Question 2

Crossing over - is the exchange of genetic material between homologous chromosomes that results in recombinant chromosomes. It is one of the final phases of genetic recombination, which occurs during prophase I of meiosis during a process called synapsis.

Answer 2

Crossing over - is the exchange of genetic material between homologous chromosomes that results in recombinant chromosomes. It is one of the final phases of genetic recombination, which occurs during prophase I of meiosis during a process called synapsis.

Question 3

Random mating - increases variation Random splicing - increases biodiversity
Mutation - permanent change of the nucleotide sequence of the genome Phenotypic variation:

The norm of reaction - the limits of the modification and variability

Broad norm of reaction, adaptability is important for survival of species. It is reversible. It’s not inherited, because it doesn’t involve a change in the sex chromosomes (exception: plants -> asexual reproduction)

It’s defined as the tendency or potential of an organism to vary. It is the result of environmental factors.

Answer 3

Random mating - increases variation Random splicing - increases biodiversity
Mutation - permanent change of the nucleotide sequence of the genome Phenotypic variation:

The norm of reaction - the limits of the modification and variability

Broad norm of reaction, adaptability is important for survival of species. It is reversible. It’s not inherited, because it doesn’t involve a change in the sex chromosomes (exception: plants -> asexual reproduction)

It’s defined as the tendency or potential of an organism to vary. It is the result of environmental factors.

Question 4

Modification:

Phenotypic changes caused by environmental factors e.g. dandelions, depending on where you plant them, they develop different characteristics (transient sex in same species of fish).

Answer 4

Modification:

Phenotypic changes caused by environmental factors e.g. dandelions, depending on where you plant them, they develop different characteristics (transient sex in same species of fish).

Question 5

Phenotype: an organisms observable characteristics

Answer 5

Phenotype: an organisms observable characteristics