Reproductive System Flashcards
How can frog calls be both sexually and naturally selected for?
Females choose the best calling males, but some predators can find these males easier
Parthenogenesis in lizards is analogous to _____ in other organisms.
Cloning
Because of _____, the individuals within a colony of bees exhibit different ploidy states.
Haplodiploidy
In humans for a pregnancy to be successful the female needs to meet certain criteria, this is thought to be what triggers menarche. Which of these was not required (traditionally) for a young girl to begin menstruating?
Lean muscle formation
Some Bivalvia rely on a parasitic relationship with fish to disperse their eggs. In most cases the eggs are usually deposited on the _____ where they develop, hatch and grow.
Gills of a fish
In the USA, the UK and the Nordic countries, a dramatic decrease in age at menarche has occurred over the last 200 years. Unfortunately, this was followed by a dramatic increase in _____, which is now declining and is at record lows in the USA.
Teen pregnancies
The largest cell based on diameter in the human body is the ____.
Ovum
Ovipositors are found on many insects, which of these taxa should have the smallest (relative to body size) ovipositor?
Butterflies depositing eggs on the surface of a leaf
Even though the initial number of sperm released during copulation is massive (10^9 or more), the journey from _____ to the egg’s zona, greatly reduces the number of sperm cells making it to the ovum. This reduction in numbers is due to uterine ____ conditions and sperm ____.
Uterus; environmental; morphology
This picture shows the ______ present in some arachnids
Sexual dimorphism
What structure(s) developed to ensure that placental mammals could feed and care for their young long after they were born?
Nipples and mammary glands
How is sex-determined?
All of these are ways sex can be determined in animals
