Question

11-16. Three genes A, R. and T are linked. Als a dominant allele for red leaves, while the recessive phenotype is green. T is the dominant allele for all plants, while gives dwarf plants. R is the dominant allele for ragged leaf margins while gives smooth leaf margins. Questions 11-16 contain statements about these genes-answer whether each statement is true or false. Consult the accompanying diagram which represents the chromosomes in the heterorygous parent of a test cross while answering the questions. Keep your mouse on the right side to scroll through all questions T 300M 20 CM зоем 20CM 11 points In a testcross result of 1000 offspring, approximately 100 offspring will have the phenotype of red and ragged O True O False 12 points The configuration of the heterozygote parent chromosomes is transrepulsion O True O False 13 in the heterozygote parent, the resulting recombinant offspring 05 points If a crossover occurs between Rir and will be Rt and IT O True O False 14 and it 5 points Approximately 20% of the offspring will be O True False The non-recombinant offspring will have the phenotypes ART and art O True O False 16 locus and the locus as 5 points There is a higher change for a crossover to occur between the compared to the "R" locus and the "A" locus O True O False

Answer 1

Answer-

11) false

12) True

13) false

14) false

15) false

16) true

The explanation is given below:

а + a rt ĐIl a RT A r t Art a RT Or . Ar to IL (ART Art art (ART (Art Ar.T ( arT ARt) 0 Parental @ S.c.oblo ③ S.c.ob/o 4 D...O ort Uwa, z cm a RT 20 30 .. single cross over frequency ca-R) = 20% single crossover frequency (R-T) = 30% Expected Double cross over frequency 30 20 100 O 100 = 0.06 11) off offspring having red, ragged phenotype = Art D...o produces Art gamete. .. Out of 10oo, D-C-o is = 0.06 X1000 = 60 out of D...o only Art is = 60 - 30 12) Arrangement of linked genes a ART art ART art cis . Trans Art | art a RT Art one Trans arrangement Dominant gene and recessive allele of other present on some clocomosome. allele gene of are

cross over between R and T a R T a Rt A r I Ã er t (14) rT from Rt and a RT A r t results a RT XX A r t and map distance between R T is 30cm. : Recombination frequency will definately be more than 20% Non recombinan will be parental one. and Art a RT ak A r t a RT 6) cross over frequency depends on map distance between a genes. The more map distance between a genes, the see higher recombination frequency. (R-T = 308 cm) > (R-A=200M) : R-T 30% > R-A= 20% : There is higher chance for cross over to occur between Rand I as compared to R and A.