science test flash cards pt 1
when did the potato famine occur
1845-1849
What could have been done to prevent it?
If the farmers had grown a variety of potatoes then the disease would not have affected it.
What is heredity
the passing on of genes and genetic traits from parent to offspring.
What did he prove?
He proved the laws of inheritance.
What did people think about heredity before Mendel?
Most people believed that traits in offspring resulted from a blending of the traits of each parent.
What is an allele
One of two or more versions of a genetic sequence at a particular region on a chromosome
What is a homozygote?
an individual that has the two of the same alleles.
What is a heterozygote
An organism that has different alleles.
What is deoxyribonucleic acid (DNA)?
is the molecule that carries genetic information for the development and functioning of an organism
Where is DNA stored?
It is located in the nucleus cell
What are genes
Genes are The basic unit of heredity passed from parent to child
What are the 4 DNA bases? What do they pair with?
The 4 bases are adenine, cytosine, guanine. And thymine. A with T, and G with C
Who discovered that the DNA structure was a double helix
1.Francis Crick, Rosalind Franklin, James Watson, and Maurice Wilkins
How did they discover this?
X-ray crystallography
When did they discover this?
1953
