Answer:
When directed mutagenesis which is also called reverse genetics is used, only a single mutation per genome is introduced. In contrast, the number of mutations per genome introduced by random mutagenesis is usually difficult to control. It is likely that the strain you obtained with a mutation in gene X after random mutagenesis contained an additional mutation or perhaps multiple mutations which ultimately was/were responsible for loss of virulence in your favorite pathogen.
Answer:
In explanation.
Explanation:
What is a punnett square used for?
It is a way to store data and keep track of things. It helps to predict the variations and probabilities that can come from cross breeding.
What do the probabilities of the possible offspring all add up to?
All can have 100%, 75%, 50%, or 25% depending on the specific trait.
Answer:
Alleles for feather colour exhibit incomplete dominance or co-dominance.
50% gray offspring + 50% black offspring
Explanation:
<em>It means that the alleles for feather colour in the hen exhibit incomplete dominance or co-dominance over one another.</em>
Assuming the allele for white colour is B, white colour will be b while the heterozygote Bb gives the gray phenotype.
Gray rooster + gray hen = 15 gray chicks, 6 black chicks and 8 white chicks.
15:6:8 is roughly 2:1:1 which is phenotypic ratio obtainable from crossing two heterozygous individuals as pointed out by Mendel.
Bb x Bb = 1BB, 2Bb, and 1bb
Crossing the gray rooster (Bb) with a black hen (bb):
Bb x bb = Bb, Bb, bb, and bb
= 2Bb (gray):2bb (black)
50% of the offspring will be gray while the remaining 50% will be black.
Answer: B. Tendons; ligaments
Explanation: Tendons are white, inelastic and tough connective tissue that attach skeletal muscle to bone. Tendons attach muscles to structures such as the eyeball. Fibres in tendons are arranged as compact parallel bundles.
A ligament is a yellow, elastic and strong fibrous connective tissue which attaches bone to bone. Ligaments usually hold bones together and keep them stable. Fibres of the ligament are compactly packed and but they are not arranged in parallel bundles as that of tendons.
