Polar bears are strong swimmers. They can swim for several hours at a time over long distances. A polar bear's front paws propel them through the water dog-paddle style
A polar bear's nostrils close when under water
excellent insulation keeps a polar bear warm through a thick layer of fur, a tough hide, and an insulating fat layer
Gregor Mendel, a priest was very curious about how traits were passed from one generation to another. He experimented with peas (29,000 plants!) for seven years and used mathematical principles to figure it all out.
Mendel determined that traits aren't blended but are instead passed on, intact, from parent to child. He found that everyone got two genes for each trait — one from the mom and one from the dad.
He also concluded that some traits are dominant and some are recessive.
Mendel took a tall pea plant and crossed it with a short one. He expected medium pea plants, but what he got was all tall pea plants! Mendel then crossed these tall babies (he called them the F1 generation) and he got three tall plants and one short plant.
Recessive trait –trait that doesn’t show up if there is a dominant gene.
Example: if you have a gene for attached ear lobe and a gene for detached ear lobe, you will have attached ear lobes as it is a dominant trait.
Phenotype -The way you look on the outside
Genotype- the way you really are deep down in your genes. Homozygous-When Alleles for a characteristic are same, the organism is homozygous for that characteristic.