Diploid organisms, such as humans and other mammals, have two copies of their genetic material in the form of homologous chromosomes. One copy of each homologous chromosome is passed to the organism from each of its parents during the process of fertilization. For many genetic traits, a diploid organism is said to be either homozygous or heterozygous at a particular locus, depending on whether its parents passed down two of the same or two different alleles for that specific sequence. Which of the following describes a homozygous locus?
Select all that apply.
1. The presence of two or more alleles fro a particular trait in the gene pool
2. The alleles at a particular position on homologous chromosomes of an individual with two true-breeding parent for different alleles
3. the alleles at a particular position on homologous chromosomes of an individual who expresses a recessive trait
4. two of the same alleles are found in a particular position on homologous chromosomes
5. two alleles that are positioned on the same chromosome
2. The alleles at a particular position on homologous chromosomes of an individual with two true-breeding parent for different alleles
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All of the following are part of the endomembrane system, except the
A) Golgi body. B) endosomes. C) lysosomes. D) peroxisomes. E) Neither C nor D are part of the endomembrane system.
A relationship in which one partner benefits and the other is unaffected is termed
A. commensalism. B. parasitism. C. independence. D. mutualism.
Sperm are formed directly from the maturation of
a. sperm mother cells. b. spermatids. c. spermatogonial cells. d. primary spermatocytes. e. secondary spermatocytes.
About how often have catastrophic destructions of the magnitude of the end-Cretaceous bolide impact occurred?
A) at intervals of a billion years B) at intervals of 10 to 100 million years C) at intervals of 10 to 100 thousand years D) only once