Question

which of the following is a treatment for infants with sickle - cell anemia?
a special diet
corrective surgery
stem cell transplantation
synthetic enzymes
question 11 (4 points)
for each genotype, a range of_____ can be expressed, thus providing a source of variability.
genetic imprints
phenotypes
karyotypes
monotypes
question 12 (4 points)
_____ is a stage in reproduction whereby an egg and a sperm fuse to create a single cell.
fertilization
osmosis
meiosis
mitosis

Explanation:

First Question (Treatment for sickle - cell anemia in infants)

Sickle - cell anemia is a genetic blood disorder. Stem cell transplantation (specifically hematopoietic stem cell transplantation) can be a curative treatment for some infants with sickle - cell anemia as it can replace the defective hematopoietic stem cells. A special diet is not a primary treatment for the underlying disorder. Corrective surgery is not used for treating sickle - cell anemia. Synthetic enzymes are not a standard treatment for this condition.

The genotype is the genetic makeup of an organism, and the phenotype is the observable characteristics (traits) resulting from the interaction of the genotype with the environment. For a given genotype, there can be a range of phenotypes expressed due to environmental and other factors, which contributes to variability. Genetic imprints are related to epigenetic regulation of gene expression in a parent - of - origin - specific manner and not about the range of expression from a genotype. Karyotypes are the number and appearance of chromosomes in a cell and not related to the expression range from a genotype. Monotypes are not a relevant term in this context.

Fertilization is the process in sexual reproduction where a sperm cell fuses with an egg cell to form a zygote (a single cell). Osmosis is the movement of water across a semi - permeable membrane and is not related to reproduction. Meiosis is the process of cell division that reduces the chromosome number by half and is involved in the production of gametes (sperm and egg), not the fusion of gametes. Mitosis is the process of cell division for growth, repair, and asexual reproduction, not the fusion of gametes.

Answer:

stem cell transplantation

Question 11 (Genotype - Phenotype relationship)