INTRODUCTIONAs Darwin developed his

INTRODUCTION
As Darwin developed his theory of evolution, he worked under a serious handicap. He didn't know how heredity worked! Although Mendel's work on inheritance in peas was published during Darwin's lifetime, its importance wasn't recognized for decades. This lack of knowledge left two big gaps in Darwin's thinking. First, he had no idea how heritable traits pass from one generation to the next. Second, although variation in heritable traits was central to Darwin's theory, he had no idea how that variation appeared.

Evolutionary biologists connected Mendel's work to Darwin's during the 1930s. By then, biologists understood that genes control heritable traits. They soon realized that changes in genes produce heritable variation on which natural selection can operate. Genes became the focus of new hypotheses and experiments aimed at understanding evolutionary change. Another revolution in evolutionary thought began with Watson and Crick's studies on DNA. Their model of the DNA molecule helped evolutionary biologists because it demonstrated the molecular nature of mutation and genetic variation.

Today, molecular techniques are used to test hypotheses about how heritable variation appears and how natural selection operates on that variation. As you will learn in this chapter, fitness, adaptation, species, and evolutionary change are now defined in genetic terms. We understand how evolution works better than Darwin ever could, beginning with heritable variation.

ผลลัพธ์ (อังกฤษ) 1:

introduction
as darwin developed his theory of evolution, he worked under a serious handicap. he didn't know how heredity worked! although mendel's work on inheritance in peas was published during darwin's lifetime, its importance wasn't recognized for decades. this lack of knowledge left two big gaps in darwin's thinking. first,.he had no idea how heritable traits pass from one generation to the next. second, although variation in heritable traits was central to darwin's theory, he had no idea how that variation appeared.

evolutionary biologists connected mendel's work to darwin's during the 1930s. by then, biologists understood that genes control heritable traits.their model of the dna molecule helped evolutionary biologists because it demonstrated the molecular nature of mutation and genetic variation.

today, molecular techniques are used to test hypotheses about how heritable variation appears and how natural selection operates on that variation. as you will learn in this chapter, fitness, adaptation, species,.

ผลลัพธ์ (อังกฤษ) 3:

INTRODUCTION As Darwin developed his theory of evolution, he worked under a serious handicap. He didn' T know how heredity worked! Although Mendel' s work on inheritance in peas was published during Darwin' s lifetime, its importance wasn 't recognized for decades. This lack of knowledge left two big gaps in Darwin' s thinking. First,he had no idea how heritable traits pass from one generation to the next. Second, although variation in heritable traits was central to Darwin's theory, he had no idea how that variation appeared.

Evolutionary biologists connected Mendel' s work to Darwin' s during the 1930S. By then, biologists understood that genes control heritable traits.They soon realized that changes in genes produce heritable variation on which natural selection can operate. Genes became the focus of new hypotheses and experiments aimed at understanding evolutionary change. Another revolution in evolutionary thought began with Watson and Crick' s studies on DNA.the DNA Their model of evolutionary biologists helped molecule because it demonstrated the molecular nature of mutation and genetic variation.

Today, molecular techniques are used to test hypotheses about how heritable variation appears and how natural selection operates on that variation. As you will learn in this chapter, fitness, adaptation, species,and evolutionary change are now defined in genetic terms.We Darwin understand how Evolution works better than ever could, beginning with heritable variation.