Inheritance and genetic variation. Flashcards
Where do children inherit characteristics from?
their parents.
What does the genetic information contain when passed from parent to child?
genes.
What are genes carried by?
chromosomes.
What is a section of genes called?
deoxyribonucleic acid (DNA).
How many chromosomes are in the human body and how many pairs of chromosomes are there?
46 chromosomes in the human body, 23 pairs.
How many genes do each chromosomes carry on average?
30000 genes.
What is the definition of genetic variation?
the differences in appearance.
When does variation occur?
when a child inherits characteristics from both of their parents.
What is not present when there is a numerical abnormality?
either missing chromosomes or additional chromosomes.
What is not present when there is a structural abnormality?
part of a chromosome may be missing, duplicated, inverted, or translocated.
When do chromosome abnormalities usually occur?
when there is an error in cell division.
What diagram is normally used when identifying sex determination or any genetic crosses?
punnet squares.
