According to the theory of inheritance of acquired...

Name: Problem 3, Chapter 15: Biology
Uploaded: 2019-07-17T03:26:41-08:00
Duration: 3 min 51 s
Channel: Justin Im
Description: According to the theory of inheritance of acquired characteristics, a. if a man loses his hand, then his children will also be missing a hand. b. changes in phenotype are passed on by way of the genotype to the next generation. c. organisms are able to bring about a change in their phenotype. d. evolution is striving toward improving particular traits. e. All of these are correct.

According to the theory of inheritance of acquired characteristics, a. if a man loses his hand, then his children will also be missing a hand. b. changes in phenotype are passed on by way of the genotype to the next generation. c. organisms are able to bring about a change in their phenotype. d. evolution is striving toward improving particular traits. e. All of these are correct.

According to the theory of inheritance of acquired characteristics,
a. if a man loses his hand, then his children will also be missing a hand.
b. changes in phenotype are passed on by way of the genotype to the next generation.
c. organisms are able to bring about a change in their phenotype.
d. evolution is striving toward improving particular traits.
e. All of these are correct.

Key Concepts

Inheritance of Acquired Characteristics

This concept, most famously associated with Lamarck, posits that modifications in an organism's traits acquired during its lifetime, as a response to environmental pressures, can be directly transmitted to its offspring. It suggests a mechanism where the effects of an organism’s experiences can alter its progeny’s features.

Phenotypic Change and Adaptation

This concept refers to the modification of observable traits (phenotype) of an organism as a response to environmental or behavioral factors. Under the inheritance of acquired characteristics, these phenotypic changes, though induced during an individual’s lifetime, are believed to be inheritable, affecting future generations.

Directed Evolution

This idea implies that evolutionary change is aimed at improvement, where the characteristics molded by an organism during its lifetime contribute to a progressive, adaptive enhancement in subsequent generations. It encapsulates the notion that evolution works toward a defined end of better-adapted or more ‘improved’ traits.

Transcript

00:01 Asks about the theory of inheritance of acquired characteristics, which was a proposal by the scientist of marne, who basically had this idea that any characteristics that you acquire throughout your lifetime are able to be passed on to your offspring.

00:20 So the classic example of this is through the giraffe.

00:24 So a giraffe originally with a short neck that we see here basically keeps on trying to reach trees that are higher up and eventually is able to stretch up stretch his neck longer and longer and eventually gains a longer neck and he the giraffe is able to pass on that characteristic of a longer neck to offspring so progeny so that is base that is the basic um rationale behind remarks theory of inheritance of acquired characteristics.

01:02 So let's see whether or not the statements that are described in this question are true based on that theory.

01:11 So the first statement says if a man loses his hand, then his children will also be missing a hand.

01:17 So this is obviously quite extreme and we know that this doesn't happen, but based on remarks actual theory of inheritance of acquired characteristics, this would be true.

01:25 So whether you make your neck longer or you lose a hand, those characteristics will be passed on to your offspring according to womarck.

01:35 So a is true.

01:37 B says changes in phenotype are passed on by way of the genotype to the next generation.

01:43 So if we think about this, there is a change in the phenotype of a giraffe, a longer neck.

01:51 And that somehow womark proposed would be transferred, would be transferred, would be.

01:56 Converted into a genotype that would be passed along the next generation.

02:02 So in contrast, we know that the truth is that you have a genotype that encodes for a phenotype, but any changes to that phenotype will not reversibly affect the genotype.

02:16 Your genome is stable throughout your life, barring random mutations...

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