If both plants in parent generation are homozygous for pea color, All plants in the F1 generation are homozygous for the yellow allele. The parents both passed on the yellow allele.
Explanation:
In Mendelian peas it is said the yellow colour is dominant over green colour.
If in F1 generation all alleles are dominant and homozygous for yellow colour allele. All four progeny are dominant and homozygous.
R R
R RR RR
R RR RR
Punnett square
both parents passed on the yellow allele.
d. jointing
Explanation:
The surface area of rocks exposed to weathering is increased by jointing.
Jointing in rocks increases their surface area.
- Surface area is the outer part of something.
- Mechanical weathering or physical weathering is highly renowned agent for increasing the surface area of rocks.
- When rocks fracture they creates cracks called joints.
- Joints increases the amount of surface exposed.
- Chemical weathering goes faster in surfaces with increased surface area.
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Answer:
Salt is commonly used in the cold climatic regions, where the snow accumulation blocks the roads. These salts are then helpful in melting the snow and clear the road for transportation. The use of this salt has a direct impact on the plants that are located adjacent to the roads. These salt particles when mixes with the soil, the solute concentrations present in the soil decreases the growing potential of the plant by decreasing the amount of water that the plant can hold. This also results in excessive loss of water. Thus, the plants in this region appears to wilt during the spring season.
They are <span>multicellular . </span>
<u>Answer:</u>
Pfr and phytochrome would be analogous to mammalian opsins in their light-sensing ability.
<u>Explanation:
</u>
- Phytochromes are proteins which are 'sensitive to light', and are able to detect light sources on the plant body.
- These form an integral part of the leaves of a plant body.
- These proteins are made up of two forms: Pf and Pfr. Pf exists in an inactive form of phytochrome which activates in the presence of light to form Pfr which is an active form.
- This Pfr induces a cellular response in the plant. Similar to the opsins in Mamalian eyes, these also change in structure when exposed to light.
- Hence, Pfr and phytochrome are the molecules which can be analogous to 'mammalian opsins' in their 'light-sensing ability'.