Genetics
What is the study of genetics?
Genes and Heredity
Where are genes found?
Chromosomes
All living organisms have genes
True!
Which is more powerful..dominant or recessive?
Dominant
Offspring
Babies!
What does the term heredity mean?
The passing of physical or mental traits from one generation to another
Why are genes important?
Genes determine our traits
All humans have a total of 46 chromosomes
False! Most humans have 46 chromosomes
How do we represent a Dominant trait vs. a recessive trait?
Dominant- upper case letter
Recessive- lower case letter
DNA... whats it stand for?
Deoxyribonucleic acid
What is DNA? Where can it be found?
Genetic material from in the nucleus part of the cell
How many pairs of chromosomes do most humans have?
23
A punnet square is used to determine the likelihood of an offspring receiving a specific type of trait
True!
Heterozygous vs. Homozygous
Heterozygous- different alleles/ letters
Homozygous- same alleles/ letter
Nucleotides
The four base pairings for DNA, known A,T,C,G
Where can DNA be found in or on the body?
Answers will vary. Examples include fingerprint, hair follicle, blood, saliva
In general, why are we given two pairs of chromosomes?
One comes our mother, one comes from our father.
DNA is not similar to your fingerprint.
False, they are similar because they both are unique to you!
What are the 3 possible pairings
1. Heterozygous
2. Homozygous recessive
3. Homozygous dominant
Hh
hh
HH
Genotype vs. Phenotype
Genotype- genes that code for a specific trait
Phenotype= the observable or physical characteristic expressed
Describe the shape of DNA
Double helix, twisted ladder
Female -XX
Male- XY
This entire unit is known as DNA
False, this is all about GENETICS
Dark hair is dominant to light hair. Tell which phenotype would be expressed based on the genotype
HH
Hh
hh
HH- dark hair
Hh- dark hair
hh- light hair
Homozygous dominant
Homozygous recessive
Homozygous dominant- two upper case alleles/ letters
Homozygous recessive- two lower case alleles