In a certain plant, yellow leaves are dominant (y) and red leaves are recessive (y). a plant with genotype yy and a plant with yy are crossed. if they have four offspring, how many would you predict would have red leaves?
a=4
b=1
c=2
d=3

The correct answer is - B) = 1

As per the information given in the question, yellow leaves (Y) is a dominant trait over red leaves (y) that is it will mask the expression of red leaves whenever the allele for yellow is present with the allele for red leaves.

The possible genotype for yellow leaves is YY and Yy whereas for red leaves is yy.

The genotype of parents is - Yy and Yy.

When they are crossed with each other, they will produce one plant with red leaves out of four offspring.

Refer punnett square.

•there must be variation for the particular trait within a population.

•the variation must be inheritable (that is, it must be capable of being passed on from the parents to their offspring).

•individuals with one version of the trait must produce more offspring than those with a different version of the trait.good

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.