7th Grade Genetics

Genetics

100

What are the structures of DNA that carry genes called?

Chromosomes

200

Where are genes located?

In the chromosomes

300

What is genetics?

Study of Heredity

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 type of organism did Gregor Mendel use to first study heredity?

Pea Plants

200

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

Gregor Mendel

300

What is heredity?

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

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

DNA/mRNA

100

Where is DNA located in the cell?

Nucleus

200

How many nitrogenous bases are there in DNA?

Four

300

What type of bond holds the bases together?

Hydrogen

400

Write the complimentary sequence of AAT GCG.

TTA CGC

500

Write the DNA sequence in mRNA ATA GGC

UAU CCG

Punnet Squares

100

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

100%

200

What is the punnet square used for?

To determine the outcome of genetic crossings.

300

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

Recessive

400

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

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%

Misc

100

How are traits passed from parent to offspring?

Through genes during reproduction

200

Name two traits that could be inherited from a parent?

Examples: hair color, eye color, height, skin color, freckles, etc...

300

Why does a Punnet Square use capital and lowercase letters?

Capital = Dominant Trait Lower Case = Recessive Trait

400

What base replaces thymine in RNA?

Uracil

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.