This statement is true. Only active transport can move molecules up a concentration gradient using energy. Passive transport on the other hand, uses no energy and occurs naturally. Therefore molecules can only move a concentration gradient.
The answer to the question B which is the principle of dominance. Say the genotype of plant 1 is TT(tall, homozygous) and plant 2 is tt(short, homozygous). <span>T is dominant over t.
Crossing the two plants, we end with genotypes that all show Tt.
Since T is dominant it will show between the two, resulting in all tall plants.</span>
The first mamals evolved even before the dinosours during the Triassic <span>period</span>
D is the correct answer. The child with no freckles would have to have two little f's, or have two recessive alleles to not get the freckles. If there is FF or fF or Ff, since there is a dominant allele, the child will have freckles.
Answer:
0
Explanation:
This question involves two genes in Betta fish; one coding for body color and the other coding for tail colour. The allele for colored body (B) is dominant over the allele for white body (b) in the first gene while allele for blue tail (T) is dominant over allele for black tail (t) in the second gene.
Thus, in a cross between a Betafish that is homozygous dominant for both genes (BBTT) and homozygous recessive for both genes (bbtt), each parent will produce only one type of gamete combination
BBTT- BT
bbtt- bt
Using this in a punnet square, all offsprings will possess a genotype: BbTt.
Since alleles B and T are dominant, a Bettafish with genotype BbTt will be phenotypically color-bodied and blue-tailed.
Hence, according to the question, the probability of producing an offspring with white body and blue tails will be O since no offspring has such genotype.
