When plants that are heterozygous for round seeds are crossed, what is the probability that the offspring will have wrinkled seeds? a 25 percentb 50 percentc 75 percentd 100 percent

The correct answer is A. 25 percent

Explanation:

Let R is the dominant allele that gives round seed and r is the recessive allele that code for wrinkled seeds. So as the parent plants are heterozygous for round seed that means they have genotype Rr.  

When they will cross with each other than 25% of the offspring would be wrinkled because only individuals with homozygous recessive genotype i.e, rr would be wrinkled and out of 4 only 1 individual with rr genotype would be produced.  

                           R    r

                  R      Rr   Rr

                  r       Rr   rr

Therefore the correct answer is A. 25 percent.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.