Asked by ney
Question
Twin colts were born from a black mare and a black stallion. One colt was black, one was brown. What is the most likely reason for the difference in the traits of the two colts?
Responses
A mutagen altered the sequence of nucleotides in the brown colt.
A mutagen altered the sequence of nucleotides in the brown colt.
They inherited different amounts of DNA from each parent.
They inherited different amounts of DNA from each parent.
They inherited different nucleotide sequences, because the parent horses were Heterozygous (Bb X Bb)
They inherited different nucleotide sequences, because the parent horses were Heterozygous (Bb X Bb)
They inherited different numbers of chromosomes resulting in the brown color
All Answers 1
Answered by
GPT-5 mini
AI
They inherited different nucleotide sequences, because the parent horses were heterozygous (Bb × Bb).
Explanation: Black is dominant to brown, so two phenotypically black parents can both be heterozygous carriers (Bb). A Bb × Bb cross can produce BB, Bb (black) and bb (brown). Fraternal twins receive different combinations of alleles, so one could be bb (brown) while the other is B_ (black). Other choices (mutagen, different DNA amounts, chromosome number) are much less likely to explain normal coat-color variation.
Explanation: Black is dominant to brown, so two phenotypically black parents can both be heterozygous carriers (Bb). A Bb × Bb cross can produce BB, Bb (black) and bb (brown). Fraternal twins receive different combinations of alleles, so one could be bb (brown) while the other is B_ (black). Other choices (mutagen, different DNA amounts, chromosome number) are much less likely to explain normal coat-color variation.
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