7th Grade Genetics

Genetics

100

The study of how traits are passed from one generation to the next.

Heredity.

200

Where are genes located?

In the chromosomes

300

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

Chromosomes

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

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

Heredity

200

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

Gregor Mendel

300

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

Pea Plants

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

100

DNA is said to resemble... 

Twisted ladder

200

The shape of DNA is known as

Double Helix

300

DNA Base Pair Rules

A with T

C with G

400

A complementary strand of DNA for

GTACG

CATGC

500

What does DNA stand for?

Deoxyribonucleic Acid

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 possible outcomes 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

For some traits, only one copy of a particular gene is needed to show a given trait. These genes are referred to as-

Dominant

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 Punnett Square use capital and lowercase letters?

Capital = Dominant Trait Lower Case = Recessive Trait

400

In asexual reproduction ___ parents are involved, but in sexual reproduction, ____ parents are involved. 

One, Two

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.