Scientists Have Studied Patterns of Mitochondrial DNA to Determine Where

question 63

Multiple Choice

Scientists have studied patterns of mitochondrial DNA to determine where humans first evolved and how they spread.Humans inherit their mitochondrial genes only from their mothers.Why aren't a father's mitochondrial genes passed to his offspring?

• A) Only a few sperm mitochondria mix with thousands of egg mitochondria,and so few of them exist that genetic methods cannot detect them.
• B) Sperm do not contribute their mitochondria to the zygote.
• C) Mitochondrial DNA is frequently lost during meiosis;therefore,sperm get little or none.
• D) Right after fertilization,the mother and father's mitochondrial DNA is recombined during meiosis,and the father's genes cannot be separated from the mother's.
• E) none of these

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