Which one of the following is an example of polygenic inheritance?
Flower colour in Mirabilis jalapa
Production of male honey bee
Pod shape in garden pea
Pod shape in garden pea
Sertoli cells are regulated by the pituitary hormone known as
FSH
GH
Prolactin
Prolactin
In Mendel's experiments with garden pea, round seed shape (RR) was dominant over wrinkled seeds (rr), yellow cotyledon (YY) was dominant over green cotyledon (yy). What are the expected phenotypes in the F2 generation of the cross RRYY x rryy?
Only round seeds with green cotyledons
Only wrinkled seeds with yellow cotyledons
Only wrinkled seeds with green cotyledons
Only wrinkled seeds with green cotyledons
One gene – one enzyme hypothesis was postulated by
R. Franklin
Hershey and Chase
A. Garrod
A. Garrod
One turn of the helix in a B-form DNA is approximately
20 nm
0.34 nm
3.4 nm
3.4 nm
C.
3.4 nm
B-DNA is helical structure with 20 diameter and the distance between the two base pairs is 3.4 and there are 10 base pairs in each turn or pitch (one round). Hence, one turn of the helix is approximately 34 or 3.4 nm
Test cross involves
crossing between two genotypes with recessive trait
crossing between two F1 hybrids
crossing the F1 hybrid with a double recessive genotype
crossing the F1 hybrid with a double recessive genotype
Antiparallel strands of a DNA molecule means that
one strand turns anti-clockwise
the phosphate groups of two DNA strands, at their ends, share the same position
the phosphate groups at thestart of two DNA strands are in opposite position (pole)
the phosphate groups at thestart of two DNA strands are in opposite position (pole)
If a colourblind woman marries a normal visioned man, their sons will be
all normal visioned
one-half colourblind and one-half normal
three-fourths colourbling and one-fourth normal
three-fourths colourbling and one-fourth normal
Restriction endonuclease
cuts the DNA molecule randomly
cuts the DNA molecule at specific sites
restricts the synthesis of DNA inside the nucleus
restricts the synthesis of DNA inside the nucleus