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.
1 Showers are only available in Yosemite Valley at Half Dome Village (formerly Curry Village) and Housekeeping Camp. Showers are not available elsewhere.  Dump stations are available at Upper Pines Campground (all year), near Wawona Campground (summer only), and near Tuolumne Meadows Campground (summer only).