Answer:
9:3:3:1
Explanation:
If two parents for a dihybrid cross are fully heterozygous for two genes, the phenotype ratio comes 9:3:3:1. Here, the alleles of both genes should exhibit complete dominance-recessiveness. This means that one allele of a gene should be able to mask the expression of its another allele. Similarly, alleles of one gene genes should assort in a random manner during anaphase-I irrespective of the assortment of alleles of another gene.
Under these conditions, each parent produces four types of gametes in equal proportion. And the random fusion of these gametes gives progeny in 9:3:3:1 phenotype ratio.
For example, a dihybrid cross between TtRr and TtRr would produce progeny in the following phenotype ratio=
9 tall and red: 3 tall and white: 3 dwarf and red: 1 dwarf and white
Here the allele T gives "tallness" while the allele "t" gives "dwarfism". The dominant allele "R" gives "red flowers" while the recessive allele "r" gives white flowers.
Answer:
Dopamine
Explanation:
Schizophrenia is a nervous disorder of the brain that affects proper thinking, speech and behaviour. Dopamine is a chemical neurotransmitter that relays signals between the body and the brain
A pioneer species is a hardy plant or algae that can take damage from a hard environment. They return after a disturbance. They increase a diversity in a region.
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Psychologist can determine eating disorder diagnosis via behaviors through mood swings, way they eat, character displayed etc. The eating disorders that can be diagnose using the behavior of the patients are:
Other behaviors includes:
- People forms schedules or rituals that gives them room for binging and purging
- People are desperate to exercise even when it not convenient for them, etc.
Anorexia Nervosa is characterized by:
- The patient always insist they are overweight even when they are thin.
- Do not like taking food at all. There is restrictive food intake via dieting or fasting.
- Exercise too much.
- Always Bingeing.
- They self-induced themselves to vomiting so as to get rid of food.
<h3>The binge-eating disorder is characterized by:</h3>
- The patient eat plenty food at once.
- Binge regularly.
- Patient do not feel like stopping when eating.
- Stress or emotional eating.
- The person eats large amounts without ever feeling hungry
- When the person feels guilty or disgust about themselves.
<h3>The bulimia nervosa disorder is characterized by:</h3>
- The person is often engage in binge eating.
- There is often compensatory purging.
- There is constant Purging and also involves vomiting, etc.
Learn more about eating disorder from
brainly.com/question/26102954
