In some sheep, the presence of beard is produced by an autosomal allele that is dominant in males and recessive in females. A beard female is crossed with a homozygous beardless male. One of the resulting F1 females is crossed with a beardless male. What proportion of the male and female progeny from this cross will have beard in F2 generation?

#Question id: 8948

#Unit 9. Diversity of Life Forms

#Question id: 2290

#Unit 1. Molecules and their Interaction Relevant to Biology

The cytoskeleton includes all of the following except

#Question id: 569

#Unit 1. Molecules and their Interaction Relevant to Biology

A small molecule that decreases the activity of an enzyme by binding to a site other than the catalytic site is termed a(n):

#Question id: 16143

#Unit 4. Cell Communication and Cell Signaling

#Question id: 1522

#Unit 4. Cell Communication and Cell Signaling

Conversion of a proto-oncogene into an oncogene, also called activation, generally involves a gain-of-function mutation. Following statements are regarding to the mechanisms that produce oncogenes from the corresponding proto-oncogenes.

A. A change in a single base pair in a proto-oncogene that results in a hyperactive or constitutively active protein product.

B. A chromosomal translocation that fuses two genes together to produce a hybrid gene encoding a chimeric protein whose activity, unlike that of the parent proteins, is permanently suppress.

C. A chromosomal translocation that brings a growth regulatory gene under the control of alternative enhancers that cause inappropriate expression of the gene.

D. Amplification of a DNA segment including a proto-oncogene so that numerous copies exist, leading to overproduction of the encoded protein.

Which of the following statements are correct?