Meiosis. 4. There are multiple alleles for the ABO blood group. Why are there only two of these alleles normally present in any one individual?

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1 Name: ate: 1. The diagram shown represents a cell that will undergo mitosis. Which diagrams below best illustrate the nuclei of the daughter cells that result from a normal mitotic cell division of the parent cell shown? 4. There are multiple alleles for the O blood group. Why are there only two of these alleles normally present in any one individual?. There are not enough nucleotides in a red blood cell to produce a third allele.. Each parent contributes only one allele for the O blood group to the offspring Each allele in the O group must be either dominant or recessive.. lood group alleles are not segregated during meiosis. 2. Meiotic cell division in animals is directly responsible for the. formation of gametes. fertilization of an egg. growth of a cell. production of muscle cells 5. Traits controlled by genes on the X-chromosome are said to be. sex-linked. incompletely dominant. homozygous. mutagenic 3. In a species of corn, the diploid number of chromosomes is 20. What is the number of chromosomes found in each of the normal egg cells produced by this species? page 1

2 6. Which process is represented by the diagram shown? 9. Which usually occurs in the first meiotic division of a primary sex cell?. fertilization. polyploidy. crossing-over. differentiation. germination. fertilization. mitotic cell division. meiotic cell division 10. In a particular variety of corn, the kernels turn red when exposed to sunlight. In the absence of sunlight, the kernels remain yellow. ased on this information, it can be concluded that the color of these corn kernels is due to the. effect of sunlight on transpiration. law of incomplete dominance. principle of sex linkage. effect of environment on gene expression 7. Occasionally during meiosis, a single homologous chromosome pair may fail to separate. human gamete produced by such a nondisjunction would have a chromosome number of Which is the result of normal meiosis and fertilization in humans?. multiple alleles. new gene combinations 8. In a fruit fly in which the diploid number of chromosomes is 8, the chromosome number in each gamete is normally. a chromosome number of 92. a polyploid condition page 2

3 12. uring egg cell production in a human female, the 21st pair of chromosomes may fail to separate. This failure to separate is known as. crossing-over. gene mutation. polyplody. nondisjunction 15. The process by which homologous chromosomes exchange segments of N is. segregation. crossing-over. fertilization. independent assortment 13. If there are 40 chromosomes in each body cell of an organism, what is the total number of chromosomes normally present in a gamete produced by that organism? Normal mitosis results in the formation of two nuclei that are genetically. identical to each other and identical to the. identical to each other but different from the. different from each other but identical to the. different from each other and different from the 14. Synapsis and disjuntion are processes directly involved in. mitotic cell division. meiotic cell division. fertilization. fission 17. uring synapsis, chromatids in homologous pairs of chromosomes often twist around each other, break, exchange segments, and rejoin. This process usually contributes to. the formation of polyploid offspring. nondisjunction of homologous chromosomes. the production of identical twins. increased variability in offspring page 3

4 18. The two parts of a double-stranded chromosome are held together by a 21. The extra chromosome found in the cells of humans with own s syndrome is the result of. nucleolus. spindle fiber. centromere. centriole. failure of the developing embryo to undergo meiotic cell division. failure of the chromatids to replicate between mitotic cell divisions. nondisjunction during meiotic cell division in the gonads of a parent. nondisjunction during mitotic cell division in the muscle cells of a parent 19. The gamete produced in the ovary of an animal is the. egg cell. sperm cell. spore. zygote 22. In sexually reproducing species, doubling of the chromosome number from generation to generation is prevented by events that take place during the process of. gametogenesis. cleavage. nondisjunction. fertilization 20. diploid cell of a normal human male contains 23. The accompanying diagram shows parts of a flower. In which structure does meiosis occur?. 22 autosomes and two Y-chromosomes. 22 pairs of autosomes and two Y-chromosomes. 22 pairs of autosomes, one X-chromosome, and one Y-chromosome. 22 autosomes and two X-chromosomes.... page 4

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