Factors critical in controlling development that are secreted into the immediate
ID: 252810 • Letter: F
Question
Factors critical in controlling development that are secreted into the immediate spaces around the cells producing them are called a juxtacrine factors b. paracrine factors c. endocrine factors d. both A and B are correct e. none of the above while structures Structures that are structurally similar due to common ancestry are said to be that are similar due to the need to perform similar function are said to be b. homologous, analogous C. non-analogous, non-homologous d. non-homologous, non-analogous e all of the above Oouble fertilzation in flowering plants results in formation of a diploid structure (2n) and a triploid structure (3n) known respectively as: a. zygote and embryo b. zygote and endoderm c. zygote and blastula d. zygote and endosperm e. zygote and neurula During development in triploblastic organisms, the three primary germ layers interact with one another through specific factors in a process known as to form tissues and organs. A. Differentiation B. Induction C. Gametogenesis D. Morphogenesis The type of cleavage pattern taking place in eggs with even yolk distribution that results in cells of equal size during early embryonic development is known as: a. Holoblastic b. Meroblastic c. Equatorial d. Both B and C are correct e. None of the above The dimple formed 180 degrees from the point of contact between the sperm and the egs during frog development is known as _and it marks the side of the emb side of the embryo. a. Blastomere, ventral b. Blastopore, ventralExplanation / Answer
1)paracine factors
paracrinefactors are secreted into the immediate spaces around the cell producing them.* These
2)homologus analogous
Structures that are structurally similar due to common ancestry are said to be homologous that are similar due to the need to perform similar function are said to be analogous.
3)zygote enodosperm
Double fertilization is a complex fertilization method where out of two sperm cells, one fuse with the egg cell and other fuses with two polar nuclei which results in diploid (2n) zygote and triploid (3n) primary endosperm nucleus (PEN) respectively.
4)
5)HOLOBLASTIC
The type of cleavage pattern taking place in eggs with even yolk distribution that results in cells of equal size during early embryonic development is known as Holoblastic.
6)BLASTOPORE
Gastrulation in the frog begins at a point on the embryo surface roughly 180 degrees opposite the point of sperm entry with the formation of a dimple, called the blastopore.
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