If relatively small carbonaceous chondrites from space were a significant source of Earthʹs original amino acids, then which two of these would have been most important in permitting their organic materials to survive impact with Earth?

I. Carbonaceous chondrites must contain no D-amino acids.

II. Earthʹs early atmosphere must have had little free oxygen.

III. The chondrites must have arrived on Earth before 4.2 billion years ago.

IV. Earthʹs early atmosphere must have been dense enough to dramatically slow the chondrites before they impacted.

V. The chondrites must have impacted land, rather than a large body of water.

#Question id: 4745

#SCPH28 | Zoology

In some goats, the presence of horns is produced by an autosomal gene that is dominant in males and recessive in females. A horned female is crossed with a hornless male. The F1 offspring are intercrossed to produce the F2. What proportion of the F2 offspring will have horns?

#Question id: 4746

#SCPH01 Biochemistry

Two independent pure line varieties having deep red and brown phenotype in their seed coat were cross, the all f1 progeny is deep red. The F2 progeny obtain from selfing show deep red and brown in ratio of 15:1. Which of the following observation is correct?

#Question id: 4746

#SCPH01 Biochemistry

Two independent pure line varieties having deep red and brown phenotype in their seed coat were cross, the all f1 progeny is deep red. The F2 progeny obtain from selfing show deep red and brown in ratio of 15:1. Which of the following observation is correct?

#Question id: 4746

#SCPH12 I Genetics

Two independent pure line varieties having deep red and brown phenotype in their seed coat were cross, the all f1 progeny is deep red. The F2 progeny obtain from selfing show deep red and brown in ratio of 15:1. Which of the following observation is correct?

#Question id: 4746

#SCPH28 | Zoology

Two independent pure line varieties having deep red and brown phenotype in their seed coat were cross, the all f1 progeny is deep red. The F2 progeny obtain from selfing show deep red and brown in ratio of 15:1. Which of the following observation is correct?

#Question id: 4747

#SCPH01 Biochemistry

How does incomplete dominance differ from incomplete penetrance?