Genetics
Heredity
Key Terms
Punnet Squares
Misc
100

What is genetics?

The study of heredity, how genes are passed down. 

100
What is heredity?
The passage of genetic instructions (traits) from parent to offspring.
100
These alleles BB are called homozygous _____________. 

what is dominant? 

100
Some genes can be hidden or covered up by another. These are considered to be-
Recessive
100
Name two traits that could be inherited from a parent?
Examples: hair color, eye color, height, skin color, freckles, etc...
200

Where are genes located?

In the chromosomes

200
Who first studied heredity and the passage of traits from one generation to the next?
Gregor Mendel
200

An organism's physical appearance is called this.

Phenotype

200
What is the punnet square used for?
To determine the outcome of genetic crossings.
200

Name at least two examples of acquired (learned) traits. 

Walking, talking, riding a bike, playing an instrument etc. 

300

We use two letters to represent a genotype AA, Aa, aa. Why are there two letters? 

one allele from each parent

300
What type of organism did Gregor Mendel use to first study heredity?
Pea Plants
300

This kind of trait is only expressed when the organism is homozygous _________.

homozygous recessive

300
A black chicken (BB) is crossed with a black chicken (BB). What percentage of offspring will be black?
100%
300

Why does a Punnet Square use capital and lowercase letters? What does each represent? 

Capital = Dominant Trait Lower Case = Recessive Trait

400
Inherited traits that children get from their parents come from-
Genes
400
The physical trait observed in an offspring is known as it's -
Phenotype
400

What do we call the genetic make up of the individual, represented by a set of letters?

Genotype

400
Having dimples is dominant (D). Not having dimples is recessive. (d) Both parents are heterozygous for the dominant trait. What percentage of the children will NOT have dimples?
25%
400

The term used for one dominant allele and one recessive allele.

Heterozygous

500

What are the threadlike structures of DNA in the nucleus of cells that carry genes called? 

Chromosomes

500

How many chromosomes do humans have?

46 or 23 pairs- 23 from mom and 23 from dad

500

For some traits, only one copy of a particular gene is needed to show a given trait. These genes are referred to as-

Dominant

500
Long ears are dominant (E) in rabbits. If one parent is homozygous dominant for the long ear trait and the other homozygours reccessive (e), what is the only possible genotype of the offspring?
Ee
500
Two dark brown rabbits have four offspring. Three of the offspring are dark and one is white. What does this tell you about the parents' genes for fur color?
Dark brown is dominant and white fur is recessive. Both parents are heterozygous.
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