When chickens with splashed white feathers are crossed with black-feathered birds, their offspring are all slate blue (blue andalusian). when blue andalusians are crossed with themselves, they produce splashed white, blue and black offspring in the ratio 1: 2: 1 respectively. show the results of the crosses below, phenotypically and genotypically.

The given cross is an example of incomplete dominance. It is a type of genetic interaction in which dominant allele is mot able express itself completely over the recessive allele.

For instance, let us take W and w be the alleles of the gene responsible for feather colors.

W is not completely dominant over w due to which the gene produces three phenotypes.

WW-  homozygous dominant produces white feather.

Ww- heterzygous produces slate blue feathers.

ww- homozygous recessive produces black feathers.

So, the genotypes of parents are WW (splashed white) and ww (black). They cross to produce all slate blue offspring, that is, Ww.

On self-crossing Ww, three types of genotypes will be produced in the ratio  1 (WW): 2 (Ww): 1 (ww). Thus, the cross will produce phenotype in the same ratio, that is, 1 (white): 2 (slate blue): 1 (black).

european union policies. the eu's long-term objective is to achieve levels of air quality that do not result in unacceptable impacts on, and risks to, human health and the environment. eu policies aim to reduce exposure to air pollution by reducing emissions and setting limits and target values for air quality.

the main environmental problems in western europe were: energy production/acid rain, nuclear power/waste, air pollution/climate, heavy metals, pesticides, water pollution, solid waste, and unforeseen accidents. many environmental problems are common to most european countries.

the oldest known insects are believed to live around 400 millions ago as suggested by the fossil records.   some plants having woody stems also evolved during this time.

after the evolution of insects the first four legged species or the tetrapods evolved in shallow freshwater habitats from the intermediate species approximately 397 million years ago. the tetrapods went on conquering the land giving rise to amphibians, reptiles, mammals and birds.

the major split in tetrapods first occurred 340 million years ago branching off from amphibians.

363 million years ago when the carboniferous period began the insects started roaming on land and taking flights, following which the four limbed tetrapods adapted in the terrestrial habitat.