A) In a normal meiosis, chromosomes align precisely at the recombination ... sequences that typically range in length from 1,000 base pairs to 5 megabases, the cytogenetic level of resolution.

In particular, it explains that humans have one fewer chromosome pair in their cells than apes, due to a mutation found in chromosome number 2 that caused two chromosomes to fuse into one.

Every person, male or female, has 22 matching pairs of chromosome ... makes the Y chromosome unique is that the information carried on Y chromosomes is inherited largely intact over time.

during prophase I), when homologous chromosomes line up in pairs and swap segments of DNA. This process, also known as crossing over, creates gametes that contain new combinations of genes ...

Each of these pairs is similar ... the location of this critical boundary on the human sex chromosomes—where they stop ...

comprising roughly 155 million DNA base pairs, makes up around 5% of the total DNA in cells. The Y chromosome extends over more than 59 million DNA building blocks (base pairs) and accounts for ...

Each human body cell contains 46 chromosomes. These can be arranged into 23 pairs. Each chromosome in a pair carries the same types of genes. The 23rd pair are the sex chromosomes: In females ...