B1

OCR 21st Century Science Revision B1

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  • Created by: zoe
  • Created on: 13-05-13 19:46
Differences between individuals of the same species are called...
Variations
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What are the two factors that cause variation...
Genetic and Environmental
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These carry the information needed for you to develop...
Genes
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Genes occur in long strings of...
Chromosomes
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Chromosomes are found in the________ of every cell..
Nucleus
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Genes control development of different characteristics by issuing what to each cell...
Instructions
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Cells carry out instructions by producing...
Protiens
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An example of structural proteins...
Collagen
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Example of functional proteins...
Enzymes
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Our genetic make up is called our...
DNA
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Chromosomes normally come in...
Pairs
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Sex cells contain...
Single Chromosomes
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Different versions of the same gene are called...
Alleles
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Inheriting two alleles that are the same...
Homozygous
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Inheriting two alleles that are different...
Heterozygous
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The combination of alleles you have...
Genotype
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The characteristics you show...
Phenotype
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You need _______ recessive alleles to show the characteristic.
Two
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You only need ______ dominant allele to show the characteristic.
One
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A punnet square is an example of a...
Genetic Diagram
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The male sex chromosomes...
XY
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The female sex chromosomes...
**
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The sex of an individual is determined by a gene on the Y chromosome called the...
Sex Determining Region Y
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Huntington's Disease...
Caused by dominant allele, affects central nervous system
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Symptoms of Huntington's Disease...
Memory Loss, Involuntary Movement, Clumsiness, Mood Changes, Inability to Concentrate
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Cystic Fibrosis...
Caused by recessive alleles, affects cell membranes
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Symptoms of Cystic Fibrosis...
Weight Loss, Difficulty in Breathing, Chest Infections, Difficulty in Digesting Food
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One way of preventing genetic diseases...
IVF
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The procedure for embryo selection is called...
Pre-implantation Genetic Diagnosis
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Genetic tests could produce False...
Positive or False negative results
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Other cards in this set

Card 2

Front

What are the two factors that cause variation...

Back

Genetic and Environmental

Card 3

Front

These carry the information needed for you to develop...

Back

Preview of the front of card 3

Card 4

Front

Genes occur in long strings of...

Back

Preview of the front of card 4

Card 5

Front

Chromosomes are found in the________ of every cell..

Back

Preview of the front of card 5
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