Answer:
250.
Explanation:
A test cross would cross the genotype AaBb with homozygous recessive genotype aabb. The cross between AaBB x aabb would produce progeny in 1:1:1:1 ratio. So, the proportion of the progeny expressing both dominant traits (AaBb) is 1/4.
Therefore, out of the total 1000 offspring, 1/4 x 1000= 250 would express the dominant phenotype for both A and B genes.
Answer:
The correct answer is: Meiosis makes it possible for a zygote to have the correct number of chromosomes.
Explanation:
Meiosis is a type of cell division used by reproducing organisms to produce the gametes (as sperm or egg cells). It has two rounds of division that results in four cells with one copy of each chromosome.
Before the division, genetic material from each chromosome is crossed over and creates new combinations of code on each chromosome. During fertilization, the cells produced by meiosis will conjoin to create a cell with copies of each chromosome again, the zygote.
Answer:
A water reservoir is an artificial lake where water is stored, so the closest would be C.
Usually cell growth in normal cells are controlled by genes that promotes cell proliferation and also inhibiting them. If a damage occurs in normal cell,the damage is either rectified or apoptosis is initiated. When these genes that control cell proliferation or apoptosis acquires mutations they lose their ability to control their cell division process thereby acquiring uncontrolled cell growth.
Answer:
The inner moons are small dark bodies that share common properties and origins with Uranus's rings. ... William Herschel discovered the first two moons, Titania and Oberon, in 1787. The other three ellipsoidal moons were discovered in 1851 by William Lassell (Ariel and Umbriel) and in 1948 by Gerard Kuiper (Miranda).