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SC7-WEEK27-GENETIC VARIATION IN SEXUAL REPRODUCTION
VIMSCHOOL
Created on December 21, 2023
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Transcript
GENETIC VARIATION IN SEXUAL REPRODUCTION
Objectives
Start
Genetic variation:
Genetic variation in sexual reproduction is a crucial process that contributes to genetic diversity within populations of organisms.
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Key aspects :
Some key aspects related to genetic variation in sexual reproduction are:
- Meiosis
- Fertilization
- alleles and genes
- Dominance and recessiveness
- Mutations
- Natural selection
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Meiosis
Meiosis: In most sexual organisms, genetic variation is achieved through a special type of cell division called meiosis. Meiosis reduces the number of chromosomes by half and generates gametes (sex cells) that have half the genetic material of normal somatic cells. During meiosis, genetic recombination's, also known as crossing over, occur where DNA segments from the parental chromosomes are exchanged, thus increasing genetic variability.
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Fertilization
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Alleles and Genes: Alleles are the different forms of a gene that can occupy a specific place on a chromosome. Genetic variation is manifested through the presence of different alleles. Individuals inherit alleles from both parents, contributing to genetic diversity.
Alleles and Genes
Dominance and Recessiveness
A recessive allele is only visible or only expressed if both parents contribute the recessive allele.
Mutations
Mutations: Genetic mutations, changes in the DNA sequence, also contribute to genetic variation.These mutations can occur spontaneously or due to environmental factors and are passed on to offspring. Mutations occur in all organisms, some are harmful, some are neutral, and some are desirable.
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Natural selection
Differences in genotypes (genetic information) can confer adaptive advantages or disadvantages, and over time, populations can change in response to natural selection.
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Summarizing
Genetic variation in sexual reproduction occurs through the combination of genetic material from two parents, meiosis, fertilization, mutations and other processes. This genetic variability is fundamental for the adaptation and evolution of species.
Welcome 6th graders!
A journey soon begin through Social Science experiences!
Let's practice
Welcome 6th graders!
A journey soon begin through Social Science experiences!
Let's practice
Welcome 6th graders!
A journey soon begin through Social Science experiences!
Let's practice
A journey soon begin through Social Science experiences!
Welcome 6th graders!
Let's practice
Welcome 6th graders!
A journey soon begin through Social Science experiences!
Let's practice
A journey soon begin through Social Science experiences!
Welcome 6th graders!
Great job!
Welcome 6th graders!
See you next time
A journey soon begin through Social Science experiences!
7TH-GENETIC VARIATION IN SEXUAL REPRODUCTION-EN © 2023 by CASURID is licensed under CC BY-NC-ND 4.0
SC.6.L.14.1Describe and identify patterns in the hierarchical organization of organisms from atoms to molecules and cells to tissues to organs to organ systems to organisms. SC.6.L.14.2 Investigate and explain the components of the scientific theory of cells (cell theory): all organisms are composed of cells (single-celled or multi-cellular), all cells come from pre-existing cells, and cells are the basic unit of life. SC.6.L.14.3 Recognize and explore how cells of all organisms undergo similar processes to maintain homeostasis, including extracting energy from food, getting rid of waste, and reproducing. SC.6.L.14.4 Compare and contrast the structure and function of major organelles of plant and animal cells, including cell wall, cell membrane, nucleus, cytoplasm, chloroplasts, mitochondria, and vacuoles. SC.6.L.14.5 Identify and investigate the general functions of the major systems of the human body (digestive, respiratory, circulatory, reproductive, excretory, immune, nervous, and musculoskeletal) and describe ways these systems interact with each other to maintain homeostasis. SC.6.L.14.6 Compare and contrast types of infectious agents that may infect the human body, including viruses, bacteria, fungi, and parasite.