In a cross of limnaea, the snail contributing the eggs was dextral but of unknown genotype. both the genotype and the phenotype of the other snail are unknown. all f1 offspring exhibited dextral coiling. ten of the f1 snails were allowed to undergo self-fertilization. one-half produced only dextrally coiled offspring, whereas the other half produced only sinistrally coiled offspring. what were the genotypes of the original parents?

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.

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.

i believe it is c: genes for body color and wing size are inherited separately from each parent.