if an organism expresses a recessive phenotype can you tell the genotype? Explain your answer by giving an example.
i cant understand how or what a good example is. please help thanks
To express a recessive phenotype, the genotype must be homozygous (both genes must be recessive) for that recessive trait.
As for examples, I searched Google under the key words "recessive genes" to get these possible sources:
http://en.wikipedia.org/wiki/Recessive_allele
http://www.blinn.edu/socialscience/LDThomas/feldman/handouts/0203hand.htm
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.
I hope this helps. Thanks for asking.
Yes, if an organism expresses a recessive phenotype, we can make a reasonable assumption about its genotype. To understand this concept better, let's consider an example.
Let's say we are studying flower color in a certain species of plants. This trait is controlled by a single gene with two alleles: "P" for purple color (dominant) and "p" for white color (recessive).
Now, let's consider an organism that shows the recessive phenotype (white flower color). This organism can only inherit the "p" allele from both of its parents because it expresses the recessive trait. If it inherited even one copy of the dominant allele "P," it would display the purple color because the dominant allele "P" masks the expression of the recessive allele "p."
Therefore, based on the recessive phenotype exhibited by the organism (white flower color), we can conclude that the genotype of the organism must be "pp" since it must have inherited the recessive allele "p" from both parents.
So, to summarize, when an organism expresses a recessive phenotype, it means it must have inherited two copies of the recessive allele for that specific trait.