Genetics
Heredity
Reproduction
Punnet Squares
Mis-cell-aneous
100
What is genetics?
The study of heredity.
100
What is heredity?
The passage of genetic instructions (traits) from parent to offspring.
100
Why don't children look exactly like their parents?
Children get half of their DNA from their biological mom, and the other half of their DNA from their biological dad. When they combine, a child won't look exactly like either parent.
100
Some genes can be hidden or covered up by another. These are considered to be -
Recessive
100
How are traits passed from parent to offspring?
Through genes during reproduction
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
Mitosis produces _______ cells that are genetically ____________ to the original.
two, identical
200
What is the punnet square used for?
To determine the outcome of genetic crossings.
200
Name two traits that could be inherited from a parent?
Examples:
hair color, eye color, height, skin color, freckles, etc...
300
What are the threadlike structures of DNA that carry genes called?
Chromosomes
300
What type of organism did Gregor Mendel use to first study heredity?
Pea Plants
300
Why don't children look exactly like their siblings?
The siblings get half of their genes from each parent, and they will not be the same as the genes that their brothers/sisters received. Each person has about 20,000 genes, so there are many different combinations and variations that can be passed down from each parent.
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?
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
For some traits, only one copy of a particular gene is needed to show a given trait. These genes are referred to as -
Dominant
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
Is this individual a biological male, or female?
Male
500
What do we call the genetic make up of the individual, represented by a set of letters?
Genotype
500
How many chromomsomes do humans have?
46 or 23 pair
500
During meiosis 1 human cell starts with _______ chromosomes and ends with ______ cells (gametes) with _____ chromosomes.
46, 4, 23
500
Long ears are dominant (E) in rabbits. If one parent is homozygous dominant for the long ear trait and the other homozygous 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.