Mendal experiment help!?!? Attached earlobes trait?

Question

Can someone please explain how: The trait "attached earlobes" could be passed on from parents to offspring? ( remember that attached earlobes are the recessive forms of the trait.)

2.) Please explain why the male determines the s*x of the offspring?

I need this for science!!! PLEASE HELP!!!! THANKS!

Answer 1

How is this a botany question?!?

Although the real answer to the question is pretty complicated, the answer your homework assignment is looking for is that both parents must have the attached earlobe trait gene becuase two recessive genes need to be provided, one from each parent, for this trait to be expressed. Unless something very unusual happens, you only get one gene from each parent.  

It is possible both parents could have free earlobes and still have a child with attached ear lobes.

Under normal circumstances, the female has two X chromosomes, so can only contribute X chromosomes to the offspring.  Males are heterozygous (have one X and one Y) for the s*x chromosome, so the only variability in determining gender is from the male.