Why is the blood-testis barrier important? a. because some blood contents are toxic to the spermatozoa b. because immature sperm cells lose their motility when they encounter any blood component c. because spermatozoa and developing cells produce surface antigens that are recognized as foreign by the immune system d. actually, the blood-testis barrier has no function?

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).

ans.

gregor john mendel is known for study of inheritance in pea plants. he used garden pea plant for his study, having alternative traits for various characters. he performed cross-breeding in pea plants to check how characters are transmitted between parents to offspring, such as cross between pure tall and pure dwarf plant. mendel studied the inheritance patterns in pea plants for various generations.

thus, the correct answer includes options and f).