https://www.youtube.com/watch?v=zNEtVaNQ0s8
There are load of terms to know about DNA, and in this video we explain all the main ones - genes, alleles, homozygous and heterozygous, dominant and recessi

https://www.pearson.com/channels/biology/asset/6f37f106/gcse-biology-dna-part-2-alleles-dominant-heterozygous-phenotypes-and-more-64
GCSE Biology - DNA Part 2 - Alleles / Dominant / Heterozygous / Phenotypes and more! #64. Skip to main content. General Biology Start typing, then use the up and down arrows to select an option from the list. ... DNA Part 2 - Alleles / Dominant / Heterozygous / Phenotypes and more! #64. Cognito. 308. views. Was this helpful? 0. Bookmarked. Hide

https://www.bbc.co.uk/bitesize/guides/zcdfmsg/revision/1
A gene is a section of DNA which controls part of a cell's chemistry - particularly protein production. is a small section of DNA on a chromosome, that code for a particular sequence of amino

https://www.bbc.co.uk/bitesize/guides/zy7vw6f/revision/1
A gene is a section of DNA which controls part of a cell's chemistry - particularly protein production. controlling human ABO blood groups has three alleles, not just two:

https://www.cognitoedu.org/coursesubtopic/b2-gcse-aqa-h-t_8.02
Genotype . The term 'genotype' can be difficult to understand because it has multiple meanings. One definition describes a genotype as: 'an individual's collection of genes'. But the more common definition in this course is: 'the two alleles present for a particular gene'. In either case, the term genotype refers to the specific genes or allele that an individual has.

https://www.bbc.co.uk/bitesize/guides/znhgrwx/revision/3
A dominant allele is always expressed, even if one copy is present. Dominant alleles are represented by a capital letter, for example you could use a B. The allele for brown eyes, B, is dominant

https://www.savemyexams.com/gcse/biology/aqa/18/revision-notes/6-inheritance-variation--evolution/6-1-reproduction/6-1-6-genetic-inheritance/
The inheritance of these single genes is called monohybrid inheritance (mono = one) As we have two copies of each chromosome, we have two copies of each gene and therefore two alleles for each gene. One of the alleles is inherited from the mother and the other from the father. This means that the alleles do not have to 'say' the same thing.

https://quizlet.com/gb/789166064/biology-topic-3-genetics-flash-cards/
Study with Quizlet and memorise flashcards containing terms like 3.3 Explain the role of meiotic cell division, including the production of four daughter cells,, 3.4 Describe DNA as a polymer made up of: a) two strands coiled to form a double helix b) strands linked by a series of complementary base pairs joined together by weak hydrogen bonds c) nucleotides that consist of a sugar and

https://www.savemyexams.com/gcse/biology_combined-science/edexcel/18/revision-notes/3-genetics/3-2-inheritance/3-2-1-key-definitions/
Key Definitions. A recessive allele needs to be i nherited from both parents in order for the characteristic to show up in the phenotype. Alleles are different forms of the same gene. You can only inherit two alleles for each gene, and they can be the same (homozygous) or different (heterozygous).

https://quizlet.com/745003443/edexcel-gcse-biology-topic-3-genetics-flash-cards/
Study with Quizlet and memorize flashcards containing terms like Define gene and genotype., B3.11 Describe the work of Mendel in discovering the basis of genetics and recognise the difficulties of understanding inheritance before the mechanism was discovered., B3.12 Explain why these are differences in the inherited characteristics as a result of alleles and more.

https://revisionworld.com/gcse-revision/biology/genetics-and-dna/alleles
Result: 50:50 chance of being either brown eyed or blue eyed. An individual is homozygous for a certain gene if they have two identical alleles.They are heterozygous for a certain gene if they two different alleles.. The genotype is the genetic makeup of an individual.For example, it is the particular combination of alleles. The phenotype is the characteristics expressed by an individual.

https://www.savemyexams.com/gcse/biology/edexcel/18/revision-notes/3-genetics/3-2-inheritance/3-2-2-key-definitions/
Key Definitions. A recessive allele needs to be i nherited from both parents in order for the characteristic to show up in the phenotype. Alleles are different forms of the same gene. You can only inherit two alleles for each gene, and they can be the same (homozygous) or different (heterozygous).

https://quizlet.com/gb/316144890/brookfield-aqa-gcse-trilogy-science-higher-topic-b6-part-2-inheritance-variation-and-evolution-flash-cards/
Alleles are different versions of genes. e.g. Ear wax has a wet allele and a dry allele. How many copies of each gene do you have? 2 - one from each biological parent.

https://online-learning-college.com/knowledge-hub/gcses/gcse-biology-help/dna-structure/
Structure of DNA. DNA is a polymer molecule made up of two strands coiled around each other to form a double helix shape. Each strand of DNA is made up of lots of monomers or repeating units known as nucleotides. Each single nucleotide is made up of a sugar molecule, a phosphate molecule and a base, as shown in the following diagram: There are

https://pango.education/maths-resource/126495/gcse-biology-dna-part-2-alleles-dominant-heterozygous-phenotypes-and-more-64
There are load of terms to know about DNA, and in this video we explain all the main ones - genes, alleles, homozygous and heterozygous, dominant and recessive, genotype and phenotype. Along the way we'll see how genes and inheritance really works!

https://pmt.physicsandmathstutor.com/download/Biology/GCSE/Notes/OCR-A/5-Genes-Inheritance-and-Selection/Detailed%20Notes.pdf
Gametes only have one copy of each chromosome. The cell makes copies of its chromosomes, so it has double the amount of genetic information and so are called diploid. The cell divides into two cells, each with half the amount of chromosomes, giving the normal amount of 46 chromosomes. Each cell divides into two again to produce four cells, each

https://www.bbc.co.uk/bitesize/topics/zm9nng8
Chromosomes, genes and DNA (CCEA) Chromosomes are made from DNA. Genes are short sections of DNA. DNA carries genetic code that determines characteristics of a living organism. Cell division (CCEA

https://pmt.physicsandmathstutor.com/download/Biology/GCSE/Notes/WJEC-Wales/Unit-2/2.3%20DNA%20and%20Inheritance.pdf
DNA. DNA is a double-stranded polymer of nucleotides, wound to form a double helix. Each strand consists of alternating sugar and phosphate molecules. The two strands are joined by a pair of bases. There are four bases: A (adenine), T (thymine), C (cytosine) and G (guanine). A pairs with T and C pairs with G. gene is a section of DNA.

https://pmt.physicsandmathstutor.com/download/Biology/GCSE/Notes/Edexcel/3-Genetics/Flashcards/Flashcards%20-%20Topic%203%20Inheritance%20-%20Edexcel%20Biology%20GCSE.pdf
Why are men more likely to show the phenotype for a recessive sex-linked trait than women? (biology only/higher) Many genes are found on the X chromosome that have no counterpart on the Y chromosome Women (XX) have two alleles for each sex-linked gene whereas men (XY) often only have one allele ∴ only one recessive allele is required

https://quizlet.com/239930926/gcse-edexcel-biology-9-1-topic-3-flash-cards/
Some alleles are dominant and some are recessive. The only time recessive alleles will be seen in the phenotype if if two recessive alleles are placed together ... Heterozygous- two different alleles eg. Hh. What can ABO blood groups be described as? Multiple alleles for one gene. ... Edexcel GCSE 9-1 Biology Topic 2 Cells and Control. 57 terms

https://www.pearson.com/channels/biology/explore/mendelian-genetics/genotype-vs-phenotype-Bio-1
GCSE Biology - DNA Part 2 - Alleles / Dominant / Heterozygous / Phenotypes and more! #64. Cognito. 342. views. ... Dominance and recessiveness describe which of two possible phenotypes are exhibited when two different alleles occur in the same individual. b. Because only one allele is present, alleles in haploid organisms are always dominant

https://www.mindluster.com/lesson/173606
Paper two covers topics 5-7: homeostasis and response; inheritance; variation and evolution; ecology and key ideas. The information below highlights what students should prepare for ahead of the GCSE exam. Previous Lesson Next Lesson. GCSE Biology DNA Part 2 Alleles Dominant Heterozygous Phenotypes and more 64 Lesson With Certificate For