Genetics
Heredity
Reproduction
Punnet Squares
7th Grade
100
What is genetics?
The study of heredity.
100
What is heredity?
The passage of genetic instructions (traits) from parent to offspring.
100

How are traits passed from parents to offspring? 

What is through genes and chromosomes during reproduction?
100
Some genes can be hidden or covered up by another. These are considered to be-
Recessive
100

Brown eyes in humans are an example of a _________________ trait.

dominant

200
Where are genes located?
In the chromosomes
200

What determines how a tiger gets it's stripes? 

What are their parents and heredity? 

200

Name two traits that could be inherited from a parent. 

What is: hair color, eye color, skin, height, freckles, widows peak. 

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

Blue eyes in humans are an example of a ______ trait.

recessive

300
What are the threadlike structures of DNA that carry genes called?
Chromosomes
300

What does heterozygous mean in genetics? 

Two alleles or genotypes that are not the same?
300
What are the squares called that cross capital and lowercase letter to show offspring outcomes?

Punnet Squares

300
A black chicken (BB) is crossed with a black chicken (BB). What percentage of offspring will be black?
100%
300
If there are 15 students and 3 teachers in a classroom, what is the student to teacher ratio?

15:3

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

if both parents are HH (curly hair), what are the odds of the children having straight hair (hh)?

0/4 or 0%

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

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.

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

Mom = Tt

dad = Tt

What is the probability of child being tt?

1/4 or 25%

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