Using a punnet square and an explanation describe if a square-eyed pet mates with another square-eyed pet can they have any round-eyed offspring?

Yes, they can have round-seeded offspring if they are both heterozygous for the square-eyed trait.

Explanation:

The question here involves a gene that codes for eye shape in a pet. Let's assume the square-eyed allele (S) is dominant over the round-eyed allele (s). This means that the S allele will mask the phenotypic expression of s in a heterozygous state (Ss).

Hence, in a heterozygous state (Ss), a square-eyed phenotype will still be produced. However, according to the question, the only way a round-eyed offspring will result from a cross between two square-eyed parents is if they are both heterozygous for the square-eyed trait (Ss).

Therefore, in a cross between a Ss and Ss pet (see punnet square in attached image), which are both square-eyed, four possible offsprings will result with genotypes: SS, Ss Ss, ss

SS and Ss genotypes are both phenotypically square-eyed while ss will be phenotypically round-eyed, since it is a recessive trait and can only be expressed in a homozygous recessive condition.

Thus, following this explanation, 1/4 of the offsprings will be round-eyed if the parents are both heterozygous for square-eyed trait.

i'd say that the moon rock is about 2.2 billion years old.

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs