Punnet Squares
Some genes can be hidden or covered up by another. These are considered to be-
Recessive
What is heredity?
The passage of genetic instructions (traits) from parent to offspring.
Sexual reproduction produces offspring that are genetically _____________ to the parents.
Similar
What is genetics?
The study of heredity.
How are traits passed from parent to offspring?
Through genes during reproduction
What is the punnet square used for?
To determine the outcome of genetic crossings.
Who first studied heredity and the passage of traits from one generation to the next?
Gregor Mendel
Asexual reproduction produces offspring that are genetically ____________ to the parent.
Identical
Where are genes located?
In the chromosomes
A number that describes how likely an event will occur.
Probability
A black chicken (BB) is crossed with a black chicken (BB). What percentage of offspring will be black?
100%
What type of organism did Gregor Mendel use to first study heredity?
Pea Plants
If you are studying a population of genetically identical individuals, you can conclude that these individuals reproduce how?
Asexually
What are the threadlike structures of DNA that carry genes called?
Chromosomes
Why does a Punnet Square use capital and lowercase letters?
Capital = Dominant Trait Lower Case = Recessive Trait
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%
The physical trait observed in an offspring is known as it's -
Phenotype
For some traits, only one copy of a particular gene is needed to show a given trait. These genes are referred to as-
Dominant
Inherited traits that children get from their parents come from-
Genes
Any of the possible forms in which a gene for a specific trait can occur.
Allele
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
How many chromomsomes do humans have?
46 or 23 pair
The sorting of chromosomes during sexual reproduction, determines -
Which traits are passed on to the offspring
What do we call the genetic make up of the individual, represented by a set of letters?
Genotype
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.