Males, on the other hand, are heterogametic, with one X chromosome and one Y chromosome. Other reptiles governed by GSD have a system, similar to one found in birds, with Z and W sex chromosomes. In this caseâwhich governs all snake speciesâmales are the homogametic sex (ZZ) and females are the heterogametic sex (ZW).
Yosemite Packing List. Your trip with Four Season Guides is sure to be one you never forget, but a big part of having lots of fun is being well prepared! Even though we provide the camping equipment essentials, there are a few things we want to be sure you donât forget! Hiking boots â well broken in!! Mid-weight boots with ankle support are best.
Photo courtesy of the California Travel and Tourism Commission/Andreas Hub. 1  Summer is the most popular time to visit the park, when all roads are open and a variety of outdoor pursuits are possible. Just be prepared for big crowds, elbow jostling on trails, jam-packed campgrounds and 'No Vacancy' signs at park lodgings. Spring is another busy time, when Yosemite Valley's waterfalls peak during April and May. Early in spring, some park roads will still be closed by snow (see the opening information), but valley campgrounds are open and lower-elevation hiking trails are passable. Plan your trip here. Fall is Yosemite's shoulder season, with fewer crowds.