Question: In fruit flies, red eyes are dominant over sepia eyes. A male with red eyes is crossed with a female with sepia eyes producing first generation offspring that all had sepia eyes. What does this indicate about the flies that were crossed?
Answer: The male is heterozygous and the female is homozygous recessive for the trait.
Hypothesis: the male fruit fly is heterozygous dominant and the female fruit fly is homozygous recessive
Supporting facts: sent1: the male fruit fly has dominant red eyes sent2: if a homozygous / pure dominant organism is crossed / bred with a homozygous / pure recessive organism , then the offspring will have a 100% probability of being heterozygous dominant sent3: if a heterozygous dominant organism is crossed / bred with homozygous / pure recessive organism , then the offspring will have a 50% probability of being heterozygous dominant sent4: sexual reproduction produces offspring with genetic material from both parents / cells with genetic material from both parent cells sent5: a homozygous recessive organism contains only recessive genes sent6: crossing / breeding a homozygous dominant organism with a homozygous recessive organism causes all their offspring to be heterozygous dominant sent7: if a heterozygous dominant organism is crossed / bred with homozygous / pure recessive organism , then the offspring will have a 50% probability of being homozygous recessive sent8: if a recessive trait is expressed, then the organism only contains recessive genes for that trait sent9: parents produces offspring sent10: if a heterozygous dominant organism is crossed / bred with homozygous / pure dominant organism , then the offspring will have a 0% probability of having recessive trait sent11: if a homozygous / pure dominant organism is crossed / bred with a homozygous / pure recessive organism , then the offspring will have a 0% probability of being homozygous recessive sent12: if the offspring of two parents have both dominant and recessive trait , then the parents have different alleles for that trait sent13: a heterozygous organism contains both dominant and recessive genes sent14: if an organism has dominant trait and one recessive gene for that trait, then the organism contains both dominant and recessive genes sent15: a fruit fly is a kind of organism sent16: red eye is a dominant trait in fruit flies sent17: if a heterozygous dominant organism is crossed / bred with a heterozygous dominant organism , then the offspring will have a 25% probability of being homozygous recessive sent18: if an offspring has a recessive trait , then each parent has at least one recessive gene sent19: if a homozygous / pure recessive organism is crossed / bred with a homozygous / pure recessive organism , then the offspring will have a 100% probability of being homozygous recessive sent20: genes are located on chromosomes sent21: sepia eye is a recessive trait in fruit flies sent22: the female fruit fly has recessive sepia eyes sent23: a red eye fruit fly crossed with sepia eye fruit fly produces offspring with sepia eye sent24: genes are able to determine the inherited characteristics of a living thing sent25: the dominant red eye male fruit fly is one of the parents
Reasoning: [BECAUSE] red eye is a dominant trait in fruit flies [AND] sepia eye is a recessive trait in fruit flies [AND] a red eye fruit fly crossed with sepia eye fruit fly produces offspring with sepia eye [INFER] int1: a dominant red eye male fruit fly crossed with a recessive sepia eye female fruit fly produces offspring with recessive sepia eye [BECAUSE] int1 [AND] if an offspring has a recessive trait , then each parent has at least one recessive gene [AND] parents produces offspring [INFER] int2: each parent fruit fly will have at least one recessive gene [BECAUSE] int2 [AND] the dominant red eye male fruit fly is one of the parents [INFER] int3: the male fruit fly has at least one recessive gene [BECAUSE] int3 [AND] the male fruit fly has dominant red eyes [AND] if an organism has dominant trait and one recessive gene for that trait, then the organism contains both dominant and recessive genes [AND] a fruit fly is a kind of organism [INFER] int4: the male fruit fly has both dominant and recessive genes [BECAUSE] int4 [AND] a heterozygous organism contains both dominant and recessive genes [AND] a fruit fly is a kind of organism [INFER] int5: the male fruit fly is heterozygous dominant for the trait [BECAUSE] a fruit fly is a kind of organism [AND] the female fruit fly has recessive sepia eyes [AND] if a recessive trait is expressed, then the organism only contains recessive genes for that trait [INFER] int6: the female fruit fly only has recessive genes for sepia eyes [BECAUSE] int6 [AND] a fruit fly is a kind of organism [AND] a homozygous recessive organism contains only recessive genes [INFER] int7: the female fruit fly is homozygous recessive for the trait [BECAUSE] int5 [AND] int7 [INFER] int8: the male fruit fly is heterozygous dominant and the female fruit fly is homozygous recessive