Monohybrid Inheritance
Learning intention: To develop an understanding of genetic variation
Success criteria: Discuss how modified monohybrid inheritance causes variation in gene pools
Embedded Files
Hei Mahi: Meiosis Review
Hei Mahi: Meiosis Review
Choose one worksheet to complete, collect a hardcopy from the teacher and complete it.
How well can you recall the processes that occur during meiosis without using notes?
Meiosis - Name the Phases.pdfName the phases
Meiosis Phases.pdfDescribe what happens at each phase
Meiosis Worksheet.pdfFill in the blanks
Mendelian Inheritance
Mendelian Inheritance
Inheritance is the passing on of characteristics from one generation to the next. A characteristic is a particular trait or feature an organism has.
In level 1 Science you would have learned the principles of Mendelian inheritance.
Gregor Mendel inheritance patterns through the study of, eg. pea plants, and from this determined that inheritance was both particulate & followed certain laws.
Law of Segregation: The two alleles for each gene are placed in different gametes (during meiosis).
Law of Independent Assortment: The inheritance of one gene does not affect the inheritance of another gene.
Law of Complete Dominance: When two different alleles are present, only one is dominant and will be expressed.
Geneticists study the inheritance of characteristics from one generation to the next to investigate inheritance patterns.
The outcomes from meiosis, mutation and sexual reproduction are then more predictable in the offspring.
From this we can design programmes to ensure the outcomes we want. For example, genetic testing & selection of embryos, assisted reproduction or breeding programmes.
This week, we will focus on Monohybrid Inhertiance.
Biozone Activities
Biozone Activities
E68 - Mendel's Laws of Inheritance, pg. 96
E69 - Dominant and Recessive Traits, pp. 97 - 98
Punnett Squares
Punnett Squares
Key vocabulary:
Genotype
Phenotype
Gene
Allele
Homozygous
Heterozygous
Dominant
Recessive
ACTIVITY: Watch the video and complete the worksheet.
ACTIVITY: Watch the video and complete the worksheet.
Biozone Activities
Biozone Activities
E70 - The Monohybrid Cross, pg. 99
E71 - The Test Cross, pg. 100
Non-Mendelian Inheritance
Non-Mendelian Inheritance
Mendelian genetics is simple genetics but in reality very few characteristics follow the complete dominance pattern - in fact the only known real of a characteristic that follows this pattern is wet or dry earwax!
In reality most situations do NOT follow the complete dominance pattern you have been taught, i.e., one allele is dominant and the other recessive.
Inheritance of traits is often more complex than just dominant and recessive.
Some traits:
Have more than just 2 alleles of variations (i.e. eye colour)
Have 2 dominant alleles
Are only passed on via sex chromosomes
Are the result of 100’s of genes being expressed
It is actually much more likely that in real situations one of the following inheritance patterns will apply in the inheritance of one characteristic:
Incomplete dominance
Codominance
Multiple alleles
Lethal alleles
Biozone Activities
Biozone Activities
E73 - Codominance in Alleles, pg. 102
E75 - Incomplete Dominance, pg. 105
E76 - Lethal Alleles, pg. 106
Further activities - Biozone book
Further activities - Biozone book
E77 - Problems Involving Monohybrid Inheritance, pg. 107
Homework:
Homework:
Biozone Activities
Biozone Activities
E72 - Practising Monohybrid Crosses, pg. 101
E74 - Codominance in Multiple Allele Systems, pp. 103 - 104
Non-Mendelian Inheritance - more videos
Non-Mendelian Inheritance - more videos
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