3. In pea plants, flowers can be purple (P) or white (p). Purple is dominant to white. In a field of peas, you count 18 plants with white flowers, and 142 plants with purple flowers. A. What is the value of p ? B. What is the value of q ? C. What is the frequency of heterozygous plants in the field? D. Check your work: p2 + 2pq + q2 = 1 Are your numbers correct?

A) p = 0.1125

B) q = 0.8875

C) The frequency of heterozygous plants in the field = 0.1997

D) p² + 2pq + q² = 0.0127 + 0.1997 + 0.7876 = 1

Explanation:

In a pea plants, Flowers can be purple (p) or white (q). Purple flowers (p) is the dominant allele and white flowers (q) are the recessive allele. They are 18 plants with white flowers, and 142 plants with purple flowers

A) According Hardy-Weinberg equilibrium equation:

p² + 2pq + q² = 1 and p + q = 1

Where p is the frequency of the dominant allele and q is the frequency of the recessive allele.

Since they are 18 plants with white flowers, and 142 plants with purple flowers, the total number of plants = (18 + 142) = 160

Therefore p = number of plants with purple flower/ total number of plants = 18/160 = 0.1125

p = 0.1125

B) q = number of plants with white flower/ total number of plants = 142/160 = 0.8875

q = 0.8875

C) The frequency of heterozygous plants in the field = 2pq = 2 × 0.8875 × 0.1125 = 0.1997

frequency of heterozygous plants in the field = 0.1997

D) Given that p² + 2pq + q² = 1

∴ (0.1125)² + 0.1997 + (0.8875)² = 0.0127 + 0.1997 + 0.7876 = 1

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.

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