A) Virus.
Viruses force host cells to produce thousands of copies of the virus by attaching to the the host cell and transmitting its genetic material into it
<span>The correct answer for the question is D. Pine needles developed as a result of a beneficial mutation that increased the survival of plants the survived to reproduce and would then pass on the beneficial mutation to its offspring. Pine needle is the needle like leaf of a pine tree. This possible origin of pine needles from primitive narrow-leafed plants is an example of natural selection. Mutations changes the sequence of amino acids in a way that the phenotype expressed will give the organism advantageous characteristics. </span>
Alright so three different alleles are A, B, and O.
A dominant to O
B is dominant to O as well
O is recessive to A and B
Answer:
Two gametes end up with 30 chromosomes, one gamete will have 31 and one will have 29.
Explanation:
During meiosis, a single diploid cell divides into four haploid cells with half the chromosome number than the parent cell.
During meiosis I, homologous chromosomes separate and the chromosome number in the two daughter cells goes down by half. During meiosis II, the "sister" chromatids separate, and the chromosome number in the respective daughter cells remains the same.
Non-disjunction of a single dyad in meiosis II causes that one of the daughter cells will have an extra chromosome, and another will be lacking one. The two other gametes will be normal.
I drew a simple example of what would happen during meiosis of a 2n=4 cell if there was non-disjunction in a single dyad during meiosis II.