Answer:
Chromosome number in gametes- haploid (n)
Chromosome number in zygote- diploid (2n)
Explanation:
Sexually-reproducing organisms make use of gametes to reproduce. The gametes are produced via the process of meiosis, which is a cell division that results in daughter cells (gametes) that have their chromosomal number reduced by half. A diploid (2n) organism i.e. possess two set of chromosomes undergoes meiosis to produce haploid (n) gametes i.e. contains one set of chromosomes. The male parent produces haploid sperm while the female parent produces haploid egg.
During reproduction, these haploid gametes (sperm and egg) combine in a process called FERTILIZATION to produce a diploid ZYGOTE. The diploid zygote then divides and grows into the full organism. Hence, since a zygote is formed by the fusion of two haploid gametes (sperm and egg), it contains a diploid chromosome number i.e. sperm (n) + egg (n) = zygote (2n)
<u>Answer</u>: Human Genome Project.
<u>Explanation</u>:
- <em>Human genome project</em> was a research collaboration undertaken in order to sequence the entire DNA of humans and locate within it the functionally important sequences, such as genes as well as identify the physical landmarks.
- The formal launch of the project took place in 1990, and it was declared complete on 14 April 2003.
The right answer is D.
The two men (Darwin and Lyell) were very close for several decades, both personally and scientifically. Darwin had read Lyell's Principles of Geology (1830-1833) during his voyage aboard the Beagle (1831-1836), in which he had found an important source of inspiration for developing his theory of natural selection.