The phenotype ratio would be 25% each for widow's peak and freckles, widow's peak without freckles, straight hairline with freckles, and straight hairline without freckles.
<h3>Dihybrid crossing</h3>
Genotype of the heterozygous parent: HhFf
Genotype of the other parent = hhff
Crossing the two parents:
HhFf = 1/4 = Widow's peak, freckles
Hhff = 1/4 = Widow's peak, no freckles
hhFf = 1/4 = straight hairline, freckles
hhff = 1/4 = straight hairline, no freckles.
More on dihybrid crossing can be found here:brainly.com/question/1185199
#SPJ1
Descriptions of both insect/bird
Both Miami blue butterflies and scrub jays have differ in this The scrub jays The “blue jay” of dry lowlands along the Pacific seaboard, the California Scrub-Jay combines deep azure blue, clean white underparts, and soft gray-brown. It looks very similar to the Woodhouse's Scrub-Jay (they were considered the same species until 2016), but is brighter and more contrasting, with a bold blue breast band.
Maimi Butterfly
Adults:The adults are small with a wingspan range of 22 to 31 mm. Females are generally larger than males. The sexes are dimorphic. The upper surface of the wings is bright blue in males. Females have reduced blue with wide gray wing borders and an orange-capped black spot along the outer margin of the hindwing. The undersides of the wings are gray in both sexes. The hindwing has a broad white submarginal band and four black postbasal spots.
Answer:
The correct option is: <em>a deficiency of dopamine in the substantia nigra.</em>
Explanation:
The substantia nigra is the principal site involved in the physiopathology of Parkinson´s disease.
Cells from this area degenerate and die progressively causing important degeneration in the central nervous system. The cells that die -with no known reason- are those that produce dopamine and proportionate dopaminergic innervation to the encephalon. In fact, almost all the symptoms exhibited by patients with the disease can be explained by the lack of dopamine in the substantia nigra.
This area uses the neurotransmitter to communicate neurons from the base ganglia. Ganglia are responsible of modulating and modifying movements.
The nigrostriatal system participates in planning and automatic execution of learned movements. When the ganglia activity decreases, so it does the amount and velocity of movements, something typical of the disease.
Anxiety, overexcitement, inability to focus, poor coordination, and shaking are common side effects of substance abuse. The class of drugs includes cocaine, nicotine, ecstasy, and amphetamines.However, any drug when used that can cause euphoria or feeling “high” can become a drug of abuse.
