Question

13 in corn plants, normal height n, is dominant to short height, n. complete these four punnett squares showing different crosses. then, circle all of the homozygous dominant offspring. put an x through all the heterozygous offspring. leave all the homozygous recessive offspring unshaded

Explanation:

Step1: Understand Punnett - square rules

A Punnett square is used to predict the genotypes of offspring from a cross. Homozygous dominant is NN, heterozygous is Nn, and homozygous recessive is nn.

Step2: First cross (assuming parents' genotypes)

Let's assume the first cross has parents with genotypes. For example, if both parents are Nn:

	N	n
n	Nn	nn

Circle NN (homozygous dominant), put an X through Nn (heterozygous), and leave nn un - shaded.

Step3: Second cross

If one parent is NN and the other is nn:

	N	N
n	Nn	Nn

Put an X through all Nn (heterozygous), no homozygous dominant or recessive in this case.

Step4: Third cross

If one parent is Nn and the other is nn:

	N	n
n	Nn	nn

Put an X through Nn (heterozygous), leave nn un - shaded.

Step5: Fourth cross

If both parents are NN:

	N	N
N	NN	NN

Circle all NN (homozygous dominant).

Since we are not given the specific genotypes of the parents for each cross, the above shows the general process for filling and marking the Punnett squares.

Answer:

The process for filling and marking the Punnett squares is as described above. For each square, identify the genotypes of the offspring as NN (circle), Nn (put an X through), and nn (leave un - shaded) based on the alleles from the parents.