Good with genetics?

Question

Explain how is it possible for two dark coated guinea pigs to have albino offspring?
and What are the genotypes and the phenotypes of the second generation?

Can anyone give me a good website where it can help me with this or you can answer for me please? I also need a website so I can study about it cause I got a test on tuesday :(

Answer 1

the genotype of the both parents should be ,in order to the offspring becomemeans that be albino...
here is a website ,I hope it can help u: http://www.ndsu.nodak.edu/instruct/mcclean/plsc431/431g.htm

Answer 2

Genetic information is encoded in chromosomes, strings of genes that are passed from parent to offspring. Every organism that reproduces sexually has two copies of each chromosome, one copy from its father and one copy from its mother. The only exception to this rule is male sex chromosomes. Males recieve an X chromosome from their mother and a Y chromosome from their father, with no copies of either.

In any pair of genes, we will normally see one gene as dominant and one gene as recessive. Dominant genes "cover up" recessive genes. For instance, in humans the gene for brown eyes is the most dominant. The gene for blue eyes is the least dominant. If you recieve a brown-eyed gene from one parent and a blue-eyed gene from the other parent, you will have brown eyes.

In the guinea pig example, the gene for dark fur is dominant, and the gene for white fur is recessive. We can look at the chances of fur color in offspring by using a Punnet square. A Punnet square is just a simple table that compares a parent's genes and shows the possible genes of the offspring.

The only way for two dark-furred guinea pigs to have a white-furred offspring is if they both carry one copy of the dominant dark-furred gene and one copy of the recessive white-furred gene. Let's take a look at the Punnet square for this match-up. In the example, we'll use "F" to represent dominant black fur and "f" to represent recessive white fur. The word "genotype" just means the organisms genetic makeup. "Phenotype" is the expression of that genotype, what the organism actually looks like.

Father's genotype: Ff
Father's phenotype: black fur
Mother's genotype: Ff
Mother's phenotype: black fur

Punnet square:


___F_ /_f____
F: FF / Ff
_____________
f : Ff / ff

So, we can see that there are four possible combinations of genes. In one of the combinations, the offspring is "FF". He has only black-fur genes and will have black fur. In two of the combinations, the offspring is "Ff". He carries both genes. He has black fur, but can pass the white-furred gene to his offspring. In one of the combinations the offspring is "ff". He has both white-furred genes and will have white fur.

Using this information, we can say that the total possible genotype and phenotype for offspring of this couple is:

Genotype: 50% "Ff", 25% "FF", 25% "Ff"
Phenotype: 75% black fur, 25% white fur

If you have any questions, feel free to message me. Hope this helped!