Question

In which of the following genotypes , both traits(A&B) are pure lines ??​

Answer 1

Answer:

A genotype is an individual's collection of genes. The term also can refer to the two alleles inherited for a particular gene. The genotype is expressed when the information encoded in the genes' DNA is used to make protein and RNA molecules. The expression of the genotype contributes to the individual's observable traits, called the phenotype.

Explanation:

Predicting the genotype of offspring

There are four possible combinations of gametes for the AaBb parent.

Half of the gametes get a dominant A and a dominant B allele; the other half of the gametes get a recessive a and a recessive b allele.

Both parents produce 25% each of AB, Ab, aB, and ab.

(Review problem #3's tutorial if necessary).



Possible gametes for each AaBb parent

Since each parent has four different combinations of alleles in the gametes, there are sixteen possible combinations for this cross. Therefore we use a 4 square by 4 square Punnett Square.



Alleles from both parents

Now we can predict the outcome of the genetic cross of AaBb x AaBb.

To determine the fraction of the offspring homozygous for both traits, first determine the genotype of an offspring homozygous for both traits. It would be aabb.