Two types of grass produce fertile offspring in the

Info iconThis preview shows pages 6–8. Sign up to view the full content.

View Full Document Right Arrow Icon
Two types of grass produce fertile offspring in the first generation, but further generations produce sterile plants A plant releases pollen which reaches the flower of another plant, but is unable to fertilize the ovule (egg) Two populations of bugs with different mating rituals are uninterested in mating with each other Bullfrogs mate in permanent ponds, whereas, red-legged frogs mate in fast-moving short lasting streams. Two different species of snakes mate, the zygote forms; however, it dies after only a few cell divisions Two species of salamanders breed during different times of the day. A male lion mates with a female tigress to produce a sterile liger Two orchids are unable to fertilize each other because their flower petals are specifically shaped for different pollinators. 7. If evolution isn’t goal oriented, why do species change over time? V. Evidence for Evolution: Read pages 299-304 1. Why are older fossils generally in deeper rock layers than younger fossils?
Background image of page 6

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Name: ________________________________________________ Period: ____ Date: ___________ 2. How are fossils formed? Refer to p. 299 in the book. 3. What is the difference between homologous and analogous structures? 4. Humans, cats, whales, and bats all have structurally similar forelimbs. What does this suggest? Explain. 5. Vertebrates and cephalopods have independently developed a camera like eye. In vertebrates the eye focuses light by changing the shape of the lens, whereas in cephalopods such as octopi, the lens focuses by moving forward and back like a camera lens. Are these two types of eye structures considered homologous or analogous structures? What kind of evolution led to similar, but structurally different eyes? 6. What is a vestigial structure? State two examples. 7.
Background image of page 7
Image of page 8
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page6 / 10

Two types of grass produce fertile offspring in the first...

This preview shows document pages 6 - 8. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online