If a single mutation turns off the growth of some pairs of legs within an organism, what's most likely affected?
a. a hox gene
b. a duplicated gene
c. a deleted gene
d. a substituted gene

its a hox gene

Ans.

In vertebrates, limb development is performed by a group of genes, known as Hox genes (homeotic box genes). These genes act as transcription factors and initiate the process of limb development in developing embryo. The Hox genes also play role in determination of head-to-tail axis of body plan.

A single mutation in Hox genes may results in formation of defective protein that turn off the growth of leg pairs in an organism. Thus, the correct answer is option A). 'a Hox gene.'

the correct option is option d

1: most common garden plants prefer loam — soils with a balance of different-sized mineral particles (approximately 40% sand, 40% silt, and 20% clay) with ample organic matter and pore space. however, some plants grow better in sandy soils, while others are well-adapted to clay soils.

2: available water capacity is the maximum amount of plant available water a soil can provide. it is an indicator of a soil's ability to retain water and make it sufficiently available for plant use. available water capacity is the water held in soil between its field capacity and permanent wilting point.

3: it is the same for all living things (plants and animals). it also includes very tiny organisms that our eyes cannot see. they are known as microorganisms, and include viruses, bacteria and fungi.