On the given Punnett square, what do the letters used as column and row headings represent (e. g., TB, Tb, tB, and tb)? Select one: a. every gene on an individual chromosome b. offspring phenotypes c. heterozygous or homozygous individuals d. parental phenotypes e. gamete genotypes

The correct answer to the question is option E

GAMETE GENOTYPES

On the given Punnett square,the letters used as column and row headings represent GAMETE GENOTYPES (e.g., TB, Tb, tB, and tb).

Explanation: A Punnett square is a graphical representation of the possible genotypes of an offspring which arises from a particular cross or breeding event. When creating a Punnett square knowledge of the genetic composition of the parents is required. The various possible combinations of their gametes are encapsulated in a tabular format. Therefore, each box in the table represents one fertilization event.

GENOTYPES are the two alleles that a cell has,the alleles can be dominant or recessive.

An allele whose phenotype always shows up in the organism when the allele is present is known as DOMINANT ALLELE while in RECESSIVE ALLELE, both copies of the allele have to be present to show this characteristic.

Dominant alleles are represented with an Uppercase letter (B, T). Recessive alleles are represented with a Lowercase letter (b or t).

There are two(2) types of punnet squares; for a monohybrid cross, these are 2X2 squares with four boxes, each representing one fertilization event between the parent gametes. The second type is used to predict the outcome of breeding experiments where two traits are being followed and the Punnett square is larger, with sixteen boxes

a tetrad is the foursome during meiosis made by two homologous chromosomes that have each already replicated into a pair of sister chromatids.