The red-green color blindness is a recessive X-linked trait. The females are not affected unless both the X chromosomes have the affected allele. Mostly, the females are the carriers, and the males are affected as they have only one X chromosome. In the given pedigree, the father of Irene have the normal allele, while her mother is a carrier. However, Irene is neither a carrier nor affected. This means that she carries normal alleles on both X chromosomes. Hence, her allele combination is 
.
Answer:
Hormones are controlled by a
(negative)
feedback system between the glands that produce this hormone and the concentration of blood calcium ions. If the level of ions is
(low)
,hormone secretion is increased. This causes resorption by cells called
which releases both calcium and phosphate ions into the blood stream.
Explanation:
Negative Feedback a the process in your body that helps to maintain Homeostasis. If some variable changes a value in your body, like your ion levels, your glands produce a hormone that causes resorption by cells. This releases both calcium and phosphate ions into the blood stream and therefore your ion levels go back to normal.
Hope this helps!
They seperate during anaphase of mitosis
Bulk flow refers to the movement of phloem sap from a source to a sink in plants.
<h3>What is Phloem?</h3>
This is a vascular tissue found in plants which helps to transport and distribution of the organic nutrients derived from photosynthesis.
Bulk flow occur when these nutrients present in the phloem sap are moved from source to sink.
Read more about Phloem here brainly.com/question/983997
Answer: Option D nutrients
Explanation: at the onset of germination, nutrients is not needed for seed germination. A viable seed has all it it inside of it to grow. For seeds to grow in any environment, they need water, light in some cases, depth of seed planted,temperature in some cases, and oxygen. It is later in it's growth mostly one or 2 weeks that the plant start needing nutrient. Some food crops like vegetables needs nutrients mostly immediately or a day after germination has already occued.
