What are the main differences in the formation of the egg and sperm in males and females?
What will be an ideal response?
Sperm formation, or spermatogenesis, in males occurs in the seminiferous tubules, which involves the development of four sperm cells from each spermatogonium. A mature male produces millions of sperm. In contrast, a mature female usually produces only one egg (technically a secondary oocyte) each month. Also, oogenesis begins during fetal development, but egg development is arrested and won't continue until ovulation and fertilization take place. In oogenesis, there will be only one viable egg produced and three polar bodies.
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bonds are formed between monomers to form a polymer
A. Hydrogen B. Nuclear C. Covalent D. Hydrophobic E. Ionic
In vertebrates, mechanoreceptors are not found in which of the following:
1.skin 2.skeletal muscles 3.walls of blood vessels 4.internal organs 5.all of these structures have mechanoreceptors
Haiti is settled by peoples of both African and European ancestry. A young couple, both with mixed ancestry, marry and have several children. The children, who all have equal exposure to sunlight, vary widely in the amount of skin melanin. One child is lighter than both parents, and one is darker. The simple explanation for this is
A. polygenic inheritance. B. the environment influenced the phenotypes of the children. C. epistasis. D. multiple alleles are available for the one chromosomal locus that governs skin color. E. gene linkage.
A gene that contains introns can be made shorter (but remain functional) for genetic engineering purposes by using _____
A) a restriction enzyme (endonuclease) to cut the gene into shorter pieces B) reverse transcriptase to reconstruct the gene from its mRNA C) DNA polymerase to reconstruct the gene from its polypeptide product D) DNA ligase to put together fragments of the DNA that code for a particular polypeptide