From question 1 on the worksheet: What are the chances Mr. and Mrs. Smith have a child with the genotype dd?

From Question 1 on the worksheet: The genotypes of the parents are

Which of the following is a discrete trait in humans?

Which of the following is a dominant trait in the flower color for the pea plants Mendel was experimenting with?

What does it mean when we say that having a hitchhiker's thumb is a "recessive trait"?

A gene,,

Allele,,

RR,,

gametes,,

natural selection

adaptations

Mendel's law of segregation

Mendel's law of independent assortment,,

The work of _________ helped Darwin to see that species evolve or change over time. However, he was wrong in his hypothesis of how those changes occurred. He thought a creature could transform in its own lifetime by just wanting or willing itself to change. For example he thought that the trunks of elephants had evolved from shorter to longer because the elephant hoped and wished for his/her trunk to be longer to reach food high up in trees. Darwin instead realized that evolution only happens over many generations, and is a result of the accumulation of many tiny changes. If food was up high, then elephants with longer trunks would have a more favorable trait, and be more likely to survive to reproduce and pass on their traits. Over time the traits would accumulate in the population and the trunks of the elephant would be longer than in previous generations.

In South America Darwin saw fossils and evidence that some species had gone extinct. Then he read __________ work on how _________ size is limited by food supply and he realized that the creatures who had favorable traits to get access to food would be the ones to survive to reproductive age and pass on their traits.

While in Chile during his trip on the Beagle, Darwin witnessed earthquakes and the huge changes they can cause to a landscape. When he got home, he read ________ work on ________ and realized that many changes to the earth over time have accumulated and the earth has a dynamic geological history. This made him see that much of evolution happens over a long time period.

In South America, Darwin saw fossils from many different kinds of animals that were similar to, but different from, present-day animals like llamas and sloths. He had already read _______ writing about fossils and _____________, so he soon realized that these were evidence that showed these were species that were now extinct. They had transformed into modern species. He suspected this had taken a long time.

Who coined the term "survival of the fittest"?