Question

1. Sister chromatids of homologous chromosomes usually carry different alleles of the same genes in the...

1. Sister chromatids of homologous chromosomes usually carry different alleles of the same genes in the same order.

a. true

b. false

2. A certain diploid organism has a cluster of rrna genes on chromosome 6 and 12. the maximum number of nucleoli that can be observed during g1 of interphase would be

a. 0

b. 1

c. 2

d. 8

e. 4

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Answer #1

1. True

The sister chromatids are identical strands of DNA. During mitosis, the sister chromatids are separated and during meiosis homologous chromosomes pair up. They carry the same genes in the same loci but can have different alleles because one half is from the female and one half from the same the male (maternal and paternal).

2.a. 0

G1 phase. G1 is an intermediate phase occupying the time between the end of cell division in mitosis and the beginning of DNA replication during S phase. During this time, the cell grows in preparation for DNA replication, and certain intracellular components, such as the centrosomes undergo replication.

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