edel-Summer 2018- Page 2 of3 QUESTION 6 Results from Gregor Mendel\'s dihybrid c
ID: 301749 • Letter: E
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edel-Summer 2018- Page 2 of3 QUESTION 6 Results from Gregor Mendel's dihybrid crosses supported gene inkage. 1 points SaeA O True o False QUESTION 7 1 points Sace Ansner What is the expected phenotypic ratio from a cross of heterorygotes (A AAh) for a phenotype that expresses incomplete dominance? o 1:1 o 1:2:1 ? 3:1 QUESTION 8 1 points Save Answer Which gamete cetermines the sex of the offspring in animals? o e88 O sperm QUESTION 9 Which scientists was the first to suggest that growth of cancerous cells was a result of atbnorma chromosomes? Hugo de Vries O Theodor Boveri O Walter Sutton O Carl CorrensExplanation / Answer
(6)False
This is because in a dihybrid cross,w hen F2 generation is observed all the genes are able to express themselves independent of each other.Therefore they follow the rule of independent assortment.And linkage is defined as a group of genes whose loci are on the same chromosome,thus not seggregating and violating the rule of independent assortment.
(7)1:2:1
Usually for a heterozygous monohybrid cross 3:1 ratio is obtained due to the expression of one gene(dominant) which represses expression of the other one(recessive gene) that is law of dominance.In contrast to this is the law of incomplete dominance in which the dominant gene is able to express itself partially and eventually the recessive gene also expresses itself as a result an intermediate phenotype is observed resulting in the ratio 1:2:1.
(8)Sperm
Egg contain only one type of sex chromosomes that is X.Whereas sperm contains both X and Y.If Sperm carries X chromosome and fuses with egg it results in XX genotype giving rise to female offspring whereas if sperm carries Y chromosome and fuses with egg it results in XY genotype giving rise to male offspring.
(9)Theodor boveri
He was the scientist which postulated that abnormal chromosomes result in cancer.
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