Carol and Joseph have freckles and curly red hair. All of their children, except one, also have freckles and curly red hair. Their son, Sam, has the same curly red hair but not one freckle! How can a child get a chromosome that is totally different from the original chromosomes of both parents?

A)

gene flow

B)

genetic drift

C)

crossing over

D)

natural selection

Question

Carol and Joseph have freckles and curly red hair. All of their children, except one, also have freckles and curly red hair. Their son, Sam, has the same curly red hair but not one freckle! How can a child get a chromosome that is totally different from the original chromosomes of both parents?














A)
 
gene flow 









B)
 
genetic drift 









C)
 
crossing over 









D)
 
natural selection

anonymous · Answer

I know this one i go with B

blues · Answer

Genetic drift is the long term change in allele frequency in an entire population - it does not have to do with genetics at the level of the individual. There is only one option on this list which concerns individual genetics rather than population genetics.

The one you want is crossing over - the exchange of genetic material between different chromosomes during gamete formation. They literally swap arms. In this case the allele controlling the unexpected trait was on one of those arms.