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- Scurs is an example of a sex-influenced traitin cattle that is dominant in males and recessive in females.A male and a female, neither of which has scurs, producea male offspring with scurs. What are the genotypes of theparents?How many alleles of genesthat condition X-linked traitsdo female and maleindividuals respectivelypresent?Do males and females show equal chances of inheriting tge trait? Why or why not?
- How to find the number ofpair of alleles involved inpolygenic inheritance usingthe number of phenotypicalforms of the trait theycondition?What type of fertilization happens when two individuals mate by brushing pollen from one plant onto a female organ of another plant (Mendel used)?Explain why the inheritance pattern of X-linked traitsdiffers in males and females.
- How does distribution of the gray crescent affectthe developmental potential of the first two daughter cells?What is meant by sayingthat in relation to a given traitconditioned by a gene withtwo different alleles thegametes are always “pure”?Why do human sex-linked recessive traits typically show up in sons more than daughters? Hint: consider the probabilities involved in the inheritance of such traits.
- Why can it be said that arecessive allele can remainhidden in the phenotype of anindividual and revealed onlywhen manifested inhomozygosity in theoffspring?Which is the type of gamete(for a given trait) produced bya dominant homozygousindividual? What is thegenotypical proportion ofthese gametes? What about arecessive homozygousindividual?What is the difference between cross-fertilization andself-fertilization?