And cabbage butterfly's white color is dominant and yellow color is recessive if a pure white cabbage butterfly meant to the yellow cabbage butterfly all the resulting butterflies are heterozygous white which cross represent the genotypes of the parents generation

The genotype of the white parent will be homozygous and dominant and the genotype of the yellow parent will be homozygous and recessive in order to produce offsprings having genotype heterozygous white.

This cross can be shown as

            w           w

W       Ww         Ww

W      Ww         Ww

In the cross, the allele W is considered to be dominant over the allele w. Hnece, the white dominant parent will have the alleles WW. The recessive parent will have the alleles ww.

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.