7th Grade Genetics

Genetics

100

What is genetics?

The study of heredity.

200

Where are genes located?

In the chromosomes

300

How many alleles (letters) do each person carry for a trait?

2

400

Inherited traits that children get from their parents come from-

Genes

500

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

Genotype

Heredity

100

What is heredity?

The passage of genetic instructions (traits) from parent to offspring.

200

The different forms of genes are known as

Alleles

300

 Two of the same genes for a trait (sometimes called purebred). BB or bb

Homozygous

400

The physical trait observed in an offspring is known as it's -

Phenotype

500

How many chromomsomes do humans have?

46 or 23 pair

Vocabulary

100

The young of a plant or animal

Offspring

200

Characteristics that an organism develops after its born.

Acquired traits

300

Something inherited from your parent. This also tells your body how to work.

genes

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

500

molecule found in the nucleus of a cell and shaped like a double helix; carries and transfers genetic information

DNA

Punnet Squares

100

Some genes can be hidden or covered up by another. These are considered to be-

Recessive

200

What is the punnet square used for?

To determine the outcome of genetic crossings.

300

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

100%

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%

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

Misc

100

How are traits passed from parent to offspring?

Through genes during reproduction

200

 G = dominant green and g = recessive yellow
A fish has a Gg genotype, what will its phenotype be?

Green

300

Why does a Punnet Square use capital and lowercase letters?

Capital = Dominant Trait Lower Case = Recessive Trait

400

T or F The mom is 5'4" and the dad is 5'10". Their son is 6'2". This is possible. True or False: Explain your answer.

True

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.