The Punnett Square Analysis

Traits get passed down from one generation to the next through Meiosis (cell division), where each parent gives you one Gene for each trait.

Read the background information in the Question Column under “How can Punnett Squares help predict the traits of offspring?”

---If given traits and parents, be able to use a Punnett square or patterns to predict the probability of offspring for a given cross and express it as a fraction, percent, or ratio.---

Recall from the background information that purple corn kernels are dominant and yellow kernels are recessive. The second ear of corn was the result of crossing two heterozygous ears of male purple corn (Pp x Pp). This is represented by the Punnett square below. Complete the Punnett square by writing the correct letters that correspond to each number indicated in the table. (4 points)

This Punnet Square represents the F1 offspring breeding with each other to create more offspring. This second set of offspring is the F2 generation. If both parents are heterozygous dominant, then the offspring expected would be: 50% heterozygous dominant, 25% homozygous dominant and 25% homozygous recessive.

* How is it possible for an offspring to exhibit a recessive trait if neither parent exhibited that

Part B: Genes X, Y, and Z are linked. Crossover gametes between genes X and Y are observed

The punnett square is used to show how humans are infected with a disease which is carried by their parents and how the occur.

A form of reproduction that requires two parents, rather than one, which introduces the possibility of genetic diversity.

There were eight different phenotypes among the progeny. The highest phenotypic frequency was the w+m+f+ at 40% of the progeny. The lowest was the w+mf+ with only 2 % of the progeny (Table 3). The sum of the recombinant frequencies between genes, table 4, was used to determine the gene distance. The recombinant frequency was determined by counting the number of individuals whose genes differed from that of the parental type. For example, how many individuals white eye gene, and miniature wing gene, differed from both wild-type or both mutants. Recombination occurred between the white and miniature gene 33 times. Recombination occurred between the miniature and the forked genes 31 times. Recombination occurred between the white and forked genes 44 time. Double recombination occurred 10 times. Therefore, genes w and f are 64 m.u. apart, m and w are 33 m.u. apart, and m and f are 31 m.u. apart (Figure

Introduction: The gene that codes for red-green color blindness, the most common form of color blindness in humans, is found on the X chromosome. One in 12 males is color blind. In females, however, color blindness affects only about 1 in 200. Why is

Sex linkage and inherited genes allow us to predict and understand how and why certain animals and plants inherit features from their parents while some don’t. Sex linkage is the condition in which a

This table helps show all the possible genotypes from one set of parents. The table shows that the genotypes purple and starchy are dominant, and the genotypes yellow and sweet are recessive.(stallsmith)

Heredity – the transmission of traits from one generation to another, from parents to offspring; the protoplasmic continuity between parents and offspring

Punnet squares can be used to predict all the possible outcomes of reproduction (crossing) between different organisms. (pg 136 Science Dimensions 4) Plotting out these outcomes in punnet squares, shows you the results of crossing dominant