Explain how positional signals alter gene expression as initially unspecialized embryonic cells acquire different functions.
Tę umiejętność sprawdza 8 zadań wzorowanych na arkuszach IB z lat 2022–2025.
Early embryonic cells receive different concentrations of signalling molecules according to their positions. Which outcome can these gradients direct? A. Immediate loss of all chromosomes B. Replication of only the mitochondrial genome C. Development of…
Specialized neurons develop early in an embryo. State the process by which cells initially become neurons.
As an embryo develops, cells with the same genome become different tissue types. Which process helps produce these differences? A. Different subsets of genes are expressed in different cells B. Each tissue necessarily replaces its DNA with an unrelated genome…
Specialized nerve cells develop during formation of the nervous system. Describe the formation of neurons.
Two cells descended from the same fertilized egg develop different structures and functions. What principally explains their specialization? A. Each cell replaces all its chromosomes with unrelated DNA B. Different sets of genes are expressed during…
The supplied sequence shows neurulation in a vertebrate embryo. The neural tube later contributes to the brain and spinal cord. Describe the changes shown during neurulation.
A root contains several specialized cell types that originated by division of the same zygote. What generally explains their different functions? A. Each type has retained only one gene B. Different patterns of gene expression produce different proteins C.…
A livestock procedure begins with fertilization, followed by divisions and separation of the cells shown. What is structure X before separation? A. A cluster of unfertilized eggs B. An early embryo C. One ovarian follicle D. A cluster of independently…
Zapisujemy na Twoim urządzeniu to, bez czego serwis nie działa, np. zalogowanie. Plików analitycznych użyjemy tylko za Twoją zgodą. Szczegóły w polityce prywatności.