1.Humans breed other species to exhibit certain traits, such as larger size in c

Question

1.Humans breed other species to exhibit certain traits, such as larger size in corn plants. This is an example of:

random mating

gene flow

eugenics

veterinary selection

artificial selection

2. If the amount of T in a sample of DNA is 20%, which of the following is true?

A = 10%

A = 20%

A = 40%

A = 80%

3. Epigenetic changes

pass from one cell generation to the next but do not alter the DNA sequence

do not pass from one cell generation to the next but do alter the DNA sequence

irreversibly alter the DNA sequence and are only passed to the next cell generation if they add an advantage

only occur in males

alter the RNA codon - amino acid assignments of the genetic code

Explanation / Answer

3) Epigenetic changes

pass from one cell generation to the next but do not alter the DNA sequence

2) If the amount of T in a sample of DNA is 20%
According to Chargaff’s rule, [A]+[G]=[C]+[T]

[A]+[G]+[C]+[T]=100%
Adenine (A) is paired to Thymine (T), A=T

Cytosine (C ) is paired to Guanine (G), G=C

Here [T]=20% therefore % of [A] is also 20%.

1) Artificial selection is a process used by humans to develop new organisms with desirable characteristics.
Humans breed other species to exhibit certain traits, such as larger size in corn plants. This is an example of:artificial selection

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