Suppose the mating had occurred between an male with a given disease (homozygous recessive) and a normal female known to be heterozygous. What would the probabilities be for 4 offspring all born normal but the 5th offspring being born with the disease?
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Suppose the mating had occurred between an male with a given disease (homozygous recessive) and a normal female known to be heterozygous. What would the probabilities be for 4 offspring all born normal but the 5th offspring being born with the disease?
Aa x aa
heterozygous female x homozygous male
| A | a | |
| a | Aa | aa |
| a | Aa | aa |
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- In a test cross between an individual with an unknown genotype that exhibits the dominant phenotype and a known homozygous recessive individual all progeny showed the dominant phenotype. The individual of unknown genotype is therefore Choose an answer below: homozygous for that gene. heterozygous for that gene. heteromorphic for that gene. heterosexual for that gene. homogametic for that gene.A man and his wife are both heterozygous for brown eyes. They have ix children all of whom have blue eyes? A) How is it explained? B) What are the chances that their next child will have brown eyes? C) What are the chances that their next child will have blue eyes.Probability: 1) Assume you have the following individuals: AaBbCcDdEe X aaBbCcddee a. What is the probability that an offspring with the genotype: aaBBccDDee will be produced? b. What is the probability that an offspring that is recessive for at least 4 characteristics will be produced? c. What is the probability that an offspring that is dominant for at least 4 characteristics will be produced?
- In a bird, codominance is seen in feather color. If a red bird is mated with red and white, what is the probability of having a red and white bird? Show the cross.Assume that in Michigan squirrels, dark brown fur (B) is dominant to black fur (b). If you mate a black squirrel with a homozygous brown squirrel, what proportion of the progeny will be heterozygous? A) ¼ B) ½ C) All D) NoneIn currant moths, their Light color is sex-linked and recessive (d) to dark color (D). Question: What are the genotype and the phenotype of the parents if a certain cross yields ½ dark and ½ light colored females and all dark males? Take note that female moths are heterogametic.
- In the same cross as question #1, what fraction of the offspring will have their father's genotype for both traits?Two plants in a cross were each heterozygous for two gene pairs (Ab/aB) whose loci are linked and 25 mu apart. Assuming that crossing over occurs during the formation of both male and female gametes and that the A and B alleles are dominant, determine the phenotypic ratio of their offspring.Assume that long fingers are Inherited as a recessive trait with an 80% penetrance. Two people heterozygous for long fingers mate and produce 3 children. What is the probability that their first child will have long fingers? What is the probability that their third child will have long fingers?
- In a mendelian monohybrid cross, which generation is always completely heterozygous?A) F2 generationB)F1 GenerationC) F3 generation D) P generationSuppose that the short allele is a meiotic drive gene, and 80% of the gametes from a heterozygous individual with tall and short alleles contain short alleles. If tall is dominant to short, what percent of individuals from a cross between a heterozygous tall individual and a homozygous recessive individual will be tall?If two brown mice are bred together, 35 of their 100 offspring are white. You hypothesize that the parents are heterozygous (Bb x Bb), support your claim using a chi square.