uestion 7 1 pts ou set up a series of Mendelian dihybrid crosses beginning with
ID: 141504 • Letter: U
Question
uestion 7 1 pts ou set up a series of Mendelian dihybrid crosses beginning with a true-breeding green, dwarf pea plant and a true-breeding yellow, tall pea plant to obtain F1 offspring. A self-cross of Fi offspring generates F2 offspring. Which of the following is a false statement regarding these crosses? O These traits are autosomal and follow a dominant/recessive mode of inheritance The original parents are homozygous for each trait they possess. O "Green, dwarf is contrasting in relation to 'yellow,tall O The traits observed among the offspring result from recombination events that occur during meiosis. Question 8 1 pts What type of cross should be used to support the hypothesis that a trait is X-linked and not autosomal? O back self reciprocal test 7 cBook 20Explanation / Answer
The traits observed among the offspring result from recombination events that occur during meiosis. The traits are idependently assorted resulting in different combination of traits i.e In F1 X F1 (GyTt x GyTt), green allele can either move with tall allele (T) or dwarf allele(t) . This distribution is random giving rise to different combination of genotypes in the F2 : GGTT, GGTt, GyTT, GyTt, GGTt, GGtt, GyTt, Gytt, GyTT, GyTt, yyTT, yyTt, GyTt, Gytt, yyTt, yytt
Reciprocal cross.The purpose of this cross is to check if the inheritance of a trait is sex linked or not. In this experiment true breeding individual are chosen. TH morgan showed that white eye trait in drosophila is X-linked via reciprocal cross experiement. In one experiment female homozygous for mutant white allele was mated with male having wildtype allele for eye color i.e red
Male (XRY) x Mutant Female (Xw Xw)
All females are red and all males are white. In females the white phenotype is hidden becuase of the presence of the dominant red phenotype. As males have only one chromosome which they inherit form their mothers, they are all white.
In Another set of experiement female homzygous for wildtype red allele (XRXR)are mated with male having the white eye phenotype (XwY)
All offsprings are red because their mother was homzygous for wildtype alleles and contributed the dominant wildtype red allele to both its male and female progeny.
Xw Xw XR XwXR (Red) XwXR (Red) Y XwY (white) XwY (white)Related Questions
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