The American curl is a type of cat with curled ears a single gene with two alleles codes for the ear shaped trait. The dominant allele (R) codes for curled ears, and the recessive allele (r) codes for straight ears. A heterozygous male curl cat is crossed with a heterozygous female curl cat. Using the allele symbols above identify the genotype of the parent cats?

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Explanation:

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.