Answer:
A) The eye colour may be controlled by one or more genes, mutation lies in two different genes and has complemented each other.
B) Parent 1: w1w1 w2+w2+ Parent 2:w1+ w1+w2w2
Gametes: w1 w2+ and w1+w2
Offspring genotype: w1 w2+ w1+ w2
Explanation:
This condition may be because of complementary genes. When the presence of two or more genes are required for a particular trait and the absent of one of the genes affects the character, it is referred to as complementary genes. In this condition the wild type of fly have AA/BB type of gene and expression of both gene is responsible for red coloured eyes.
a. Mutation in any of the genes, affect the accumulation of red pigment in eyes and cause the eyes to be white colored. Given that two mutants W1 and W2 have white eyes but both have mutation in different genes. Suppose W1 has mutation in AA gene(genotype aaBB )and mutant W2 has mutation in BB gene (genotype AAbb).
b. Crossing between mutants give red colour eyes fly:
Parents AAbb x aaBB
Gametes Ab aB
Progeny AaBb
That is,
Parent 1: w1w1 w2+w2+ Parent 2:w1+ w1+w2w2
Gametes: w1 w2+ and w1+w2
Offspring genotype: w1 w2+ w1+ w2
Result: progeny of mutant have both type of functional alleles (A and B), responsible for red colour of eyes. Thus the progeny will be with red colour eyes.
The phosphorous cycle differs from the carbon cycle in the way that it cannot be found in the gas form.Phosphorous is only found on land, in water and in sediment.
Answer:
It is important for the cell to be able to bring necessary nutrients immedriately where it needs to and to be able to dispose of harmful byproducts of the cell process. It is equally important to be able to regulate water concentration.
Answer:
9/16 black, 3/16 brown, 4/16 white
Explanation:
BD Bd bD bd
BD BBDD BBDd BbDD BbDd
Bd BBDd BBdd BbDd Bbdd
bD BbDD BbDd bbDD bbDd
bd BbDd Bbdd bbDd bbdd
A punnet square can be described as a diagram which is made to predict the genotype as well as the phenotypes of the offsprings of a cross.
To study the epistatis nature of the pigmentation in bear, a punnet square was made and the results of the punnet square are shown above.
The results of the punnet square show that the cross between two bears will have the chances of producing 9/16 black bears, 3/16 brown bears and 4/16 white bears.
