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).

the level of progesterone is low at the pre-ovulatory phase of the cycle but it gradually increases and the levels are high at the luteal phase. if pregnancy occurs, the level of progesterone will be high throughout the pregnancy.

if egg is fertilized and the mother gets pregnant, progesterone starts preparing the uterus for the implantation. it starts building up the lining of uterus and make it hostile of the period of pregnancy.