#Question id: 10540
#SCPH05 I Biotechnology
The following statements are made regarding volatile compounds of plant;
a) secondary metabolites also fuction in defence mechanism but this is not the volatile compound
b) These volatiles can act as cues for natural enemies of the insect herbivore such as parasitic wasps
c) All plants releases green-leaf volatiles in response to mechanical damage that is a mixture of aldehydes, alcohols, and esters
d) These volatiles attracts natural enemies of the attacking insect herbivores—predators or parasites
Which one of the following options represents a combination of correct statements?
#Question id: 11537
#I Life Science/ Life Sciences Group – I-V
Testosterone is an example of a chemical signal that affects
the very cells that synthesize it, the neighboring cells in the testis, along
with distant cells outside the gonads. Thus, testosterone is an example of
________.
#Question id: 4765
#SCPH01 Biochemistry
The recessive mutant allele that causes cystic fibrosis is much more frequent in Caucasians population than in other world populations. Some scientists believe heterozygotes must have had a survival advantage during plagues such as cholera that occasionally swept through this population. What concept does this illustrate?
#Question id: 15155
#SCPH01 Biochemistry
In this problem we will explore some of the many ways that mutations in two different genes can interact to produce different Mendelian ratios. Consider a hypothetical insect species that has red eyes. Imagine mutations in two different unlinked genes that can, in certain combinations, block the formation of red eye pigment yielding mutants with white eyes. In principle, there are two different possible arrangements for two biochemical steps responsible for the formation of red eye pigment. The two genes might act in series such that a mutation in either gene would block the formation of red pigment. Alternatively, the two genes could act in parallel such that mutations in both genes would be required to block the formation of red pigment.
Further complexity arises from the possibility that mutations in either gene that lead to a block in enzymatic activity could be either dominant or recessive. If the crosses between a wild type insect with red eyes and a true breeding white eyed strain with mutations in both genes. Such considerations yield the Pathways in parallel with dominant mutations in both genes, determine the phenotype of the F1 progeny and the expected phenotypic ratio of red to white eyed insects in the F2.
#Question id: 5702
#SCPH06 I Botany
What is probability of couple where male is karyotypically normal and the female in pericentric inversion in heterozygous condition produced child with disability if no crossing over takes placed within pericentric inversion. (Note: Duplication and deletion in gamete will results in disability)