The first cloned mammal, Dolly the sheep, was created using: MCQ with Answer and Explanation

Explanation:
The dermis, lying beneath the epidermis, is a connective tissue layer containing collagen and elastin fibers, blood vessels, nerve endings, sweat glands, hair follicles, and sebaceous glands. The epidermis is the outermost protective layer, the hypodermis is subcutaneous fat, and the stratum corneum is the outermost part of the epidermis.

Explanation:
Pleiotropy is when one gene influences several distinct phenotypic characteristics. Example: sickle cell disease (mutant hemoglobin affects RBC shape, causing anemia, pain, organ damage). Polygenic traits involve many genes, codominance both alleles expressed, epistasis gene interaction.

Explanation:
The hepatic portal system directs nutrient-rich blood from intestines to liver. Blood pressure is highest in arteries; fish have two-chambered heart; foramen ovale is a fetal structure that closes after birth.