Answer:
Following Statements are true.
1. Cells receive molecular signals that communicate their position in relation to other cells.
3. Differential gene expression affects the developmental process in animals.
4. Positional information controls pattern formation.
6. Homeotic genes code for transcription factors that control the development of segment-specific body parts.
Explanation:
The formation of an eukaryotic organisms's spatial organization which includes organ formation and tissue arrangement is called as Pattern formation.
Molecular signals are received by cell. This phenomenon collectively refereed as positional information. Through this phenomenon cells are informed about their locomotion with respect to body axes and other cells. Regulation of pattern formation is controlled by Positional information.
When body axes is established a gene called homeotic gene start working as regulatory genes. This gene identify specific body segment in an organism which results in the formation of segment-specific body structures in the correct locations on the body.
Answer:
A. Month 6 because it had an average of 15.2 hours of sunlight.
Explanation:
Summer Solstice occurs in June, which is the sixth month of the year. Summer Solstice is the longest day of the year, for the Northern hemisphere this is between the 20, 21 or 22 of June, During one of these days, the Northern hemisphere is more exposed to the sun rays giving more hours of sunlight, which means a longer day.
Rinderpest disease is caused by a virus that affects hoofed animals, including cattle and wildebeest. In the 1950s, a cattle vaccination program was implemented to eradicate the disease in the Serengeti, and this led to dramatic changes in the populations of wildebeest and other species. The figure shows the number of wildebeest in the Serengeti ecosystem (shaded circles, left y-axis) and the prevalence (i.e., percentage) of individuals infected by rinderpest disease (unshaded squares and triangles, right y-axis) from 1958 to 2003.
Answer: The correct answer is A) Stratum basale.
Sudoriferous glands are also called as 'Sweat glands'. They are exocrine glands as they secrete their substances through the duct. They are tiny tubular glands with the secretory unit which is present in the dermis or subcutaneous tissue, and a duct which opens on the surface of the skin. Their primary role is regulation of body temperature as by sweating, body heat is lost.
During fetal development, sudoriferous glands develop from the Stratum basale. It is the deepest layer of the epidermis. It is made up of a single layer of cells which are resting upon the basement membrane, a layer present between dermis and epidermis.
Thus, sudoriferous glands are derived from Stratum basale during fetal development.
