Punnett squares
by lucas DAUGHERTY
A Punnett square is a grid system that can be set up and used to predict the possible outcomes
that may result from the mating process between two individuals, when their genotypes are
known. Or in other words it tells us the possible traits that the offspring of two parents could have such as hair color, or eye color.
The parents are the two organism that are being “crossed” in this example the parents would be Aa and Aa
In this Punnett Square, if “A” was brown hair and “a” was blonde hair we could determine possible hair colors of the offspring. In the top left box, the offspring will have brown hair as it contains two of the brown hair alleles. In the top right and bottom left there are one of each of the alleles, but, the offspring will have brown hair since brown hair is the dominant allele. in the bottom right the offspring will have blonde hair as it contains two blonde hair alleles
Heredity is the process in which traits (characteristics that can be passed only from a living thing to its young) are passed from parents to offspring. Since twins have the same genotype, the punnett square will look the exact same for both couples. The offspring of the two couples could be very similar, but there is also the chance they will be very different. If the punnett square above represented hair color and “A” was brown hair and “a” was blonde hair, each set of the offspring could be very different. While chances are they will all have brown hair, there is a 25% chance that the offspring of each couple could have blonde hair. This means that the offspring could be complete opposites from the other couple, even though the genotype of the parents are the exact same. Therefore, the fact that two twins are having babies with two twins will have no effect on the outcome of the baby's genetic code.
that may result from the mating process between two individuals, when their genotypes are
known. Or in other words it tells us the possible traits that the offspring of two parents could have such as hair color, or eye color.
The parents are the two organism that are being “crossed” in this example the parents would be Aa and Aa
In this Punnett Square, if “A” was brown hair and “a” was blonde hair we could determine possible hair colors of the offspring. In the top left box, the offspring will have brown hair as it contains two of the brown hair alleles. In the top right and bottom left there are one of each of the alleles, but, the offspring will have brown hair since brown hair is the dominant allele. in the bottom right the offspring will have blonde hair as it contains two blonde hair alleles
Heredity is the process in which traits (characteristics that can be passed only from a living thing to its young) are passed from parents to offspring. Since twins have the same genotype, the punnett square will look the exact same for both couples. The offspring of the two couples could be very similar, but there is also the chance they will be very different. If the punnett square above represented hair color and “A” was brown hair and “a” was blonde hair, each set of the offspring could be very different. While chances are they will all have brown hair, there is a 25% chance that the offspring of each couple could have blonde hair. This means that the offspring could be complete opposites from the other couple, even though the genotype of the parents are the exact same. Therefore, the fact that two twins are having babies with two twins will have no effect on the outcome of the baby's genetic code.