Transcribed Image Text: punnett square practice 1. Let’s say that in seals, the gene for the length of the whiskers has two alleles. The dominant allele (W) codes long whiskers and the recessive allele (w) codes for short whiskers. a. What is the probability of producing offspring that have short whiskers from a cross of two long-whiskered seals, one that is homozygous dominant and one that is heterozygous? Show your work on the punnett square. % long whiskers % short whiskers
In order to determine the probability of producing offspring with short whiskers from a cross of two long-whiskered seals, we need to use a Punnett square. Given the information provided, we know that the dominant allele (W) codes for long whiskers and the recessive allele (w) codes for short whiskers.
Let’s begin by labeling the alleles of the homozygous dominant seal as WW and the alleles of the heterozygous seal as Ww. We will create a Punnett square by placing the alleles of one parent along the top, and the alleles of the other parent along the side.
For the homozygous dominant seal (WW), the alleles are W and W. For the heterozygous seal (Ww), the alleles are W and w.
W W
W WW WW
w Ww Ww
Now, we can determine the possible genotypes and phenotypes of the offspring by combining the alleles in the Punnett square. The genotypes and phenotypes are as follows:
– 100% of the offspring will have the genotype Ww, meaning they will carry one dominant allele (W) and one recessive allele (w).
– 100% of the offspring will have long whiskers, as the dominant allele (W) codes for long whiskers.
So, in this case, there is no possibility for producing offspring with short whiskers, as both parents have the dominant allele for long whiskers.
In summary, the probability of producing offspring with short whiskers from a cross of a homozygous dominant seal (WW) and a heterozygous seal (Ww) is 0%. All offspring will have the genotype Ww and phenotype of long whiskers.
Please note that this Punnett square assumes that the length of whiskers is solely determined by this one gene and is not influenced by any other factors. Additionally, this is a simplified scenario and excludes the possibilities of other alleles or genetic variations influencing whisker length.