Can anyone help me with3,6 and 9

In which of the following organisms or structures would some cells divide meiotically? a. leaf epidermal cell b. E. coli c. Archaebacterium d. Drosophila A cross between a male and female Drosophila gives two phenotypes of progeny in an 1:1 ratio. You infer that the cross was: a. a monohybrid cross b. a dihybrid cross c. a heterozygote and a homozygote d. a product of epistasis e. one involving sex linkage Which of the following chromosomal structures is only be during M phase of the cell cycle? a. kinetochores b. telomeres c. origins of replication d. centromeres e. centrioles. The diploid chromosome number in Drosophila is 8. How many centromeres would be present in a gamete? a. 2 b. 4 c. 8 d. 16 e. 32 In what stage of mitosis are sister chromatids first separated? a. prophase b. prometaphase c. metaphase d. anaphase e. telophase What is the most common reason for alleles at two different genes to segregate together? a. homologous chromosomes fail to separate b. the genes are on different chromosomes c. the genes are on the same chromosome d. sister chromatids fail to separate During which part of meiosis do chromosomes first appear as paired threads? a. leptotene b. zygotene c. pachytene d. diplotene e. diakinesis. If a woman who is homozygous for a sex-linked recessive allele has children with an unaffected man, what proportion of their sons present would be expected to show the recessive phenotype? a. all of them b. 1/2 c. 1/4 d. none of them Parents from two lines true-breeding for different phenotypes at a single trait are crossed, and the F1 are intercrossed giving progeny in a 1:2 1 phenotypic ratio, which of the following is NOT a possible explanation? a. complete dominance b. codominance c. incomplete dominance d. haploinsufficiency