Crossing-over occurs between

a) sister chromatids of the same chromosome
b) chromatids of nonhomologus chromosomes
c) non sister chromatids of a homologous pair
d) Both b and c are correct


Answer: c) non sister chromatids of a homologous pair

Biology & Microbiology

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BRCA1 is a gene involved in repair of double-stranded DNA breaks. Mutant forms of this gene are linked to a substantial proportion of familial breast cancers

A woman who inherits a certain allele of the gene has about a 60-80% chance of getting breast cancer, as well as an elevated chance of getting ovarian cancer, in her lifetime. a. Why don't a higher percentage of women with the mutation get breast cancer? b. How would the breast cancer inheritance caused by BRCA1 be described in Mendelian terms?

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Protozoan cysts are resistant to many disinfection methods

Indicate whether the statement is true or false

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Emergent properties of living systems are properties that ________.

Fill in the blank(s) with the appropriate word(s).

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