Gene S controls the sharpness of spines in a type of cactus. Cactuses with the dominant allele, S, have sharp spines, whereas ho
mozygous recessive ss cactuses have dull spines. At the same time, a second gene, N, determines whether or not cactuses have spines. Homozygous recessive nn cactuses have no spines at all. If doubly heterozygous SsNn cactuses were allowed to self-pollinate, the F2 would segregate in which of the following ratios?
A) 3 sharp-spined:1 spineless
B) 1 sharp-spined:2 dull-spined:1 spineless
C) 1 sharp-spined:1 dull-spined:1 spineless
D) 1 sharp-spined:1 dull-spined
E) 9 sharp-spined:3 dull-spined:4 spineless
The answer is E) <span>9 sharp-spined:3 dull-spined:4 spineless.
It is known that the in </span><span>dihybrid</span> cross (a cross between two different traits), the phenotypic ratio between the offspring in the F2 generation is 9:3:3:1<span>: 9 - individuals with both dominant traits (SSNN), 3 - individuals with the first dominant trait and the second recessive trait (SSnn), 3 - </span><span>individuals with the first recessive trait and the first recessive trait (ssNN), </span><span>1 - individual with both recessive traits (ssnn).
According to this, there will be 9 sharp-spined cactuses (SSNN), 3 dull-spined cactuses (ssNN), and 4 spineless cactuses (3 cactuses with SSnn genotype and 1 cactus with ssnn genotype).
A heat source could be considered a source of pollution.
Explanation:
The reason behind this is that global warming is attributed to the general warming o the planet's temperature without making a specification of a single source or a singular type of origin. It just accounts for warming. One of the major discoveries of this problem was the fast-food chain's contribution to global warming. Saying that the fast-food industry provides a considerable amount of warming to the planet.
Jenny underwent a prenatal test or procedure known as <span>Amniocentesis<span>. The<span> small amount of amniotic fluid (less than one ounce) removed from the sac surrounding the </span></span>fetus<span> is then sent to the laboratory for analysis. Prior to amniocentesis, a complete anatomical ultrasound should be done to patient. </span></span>