Practice free Botany NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
which cross yielded a ratio of 7:1 :1:7 ?
The 7:1:1:7 ratio was observed by Bateson and Punnett in a test cross involving a dihybrid cross. This ratio is indicative of gene linkage with partial recombination, showing that the genes are not assorting independently but are somewhat linked.
Which among the given genotypes will produce maximum number of different types of gametes?
where n is the number of heterozygotes.
What was the expected ratio of Fd2d by Bateson and Punnet in their dihybridization experiment done on Lathyruas odoratus?
What is called Free martin ?
Out of the following , Find out the reason for occurrence of free martin in cattles ?
The occurrence of Free Martin in cattle is due to multiple factors: both twins being connected by a common umbilical cord, the earlier development of male gonads, and the influence of male hormones on the female embryo. These combined factors result in the female embryo developing intersex characteristics and becoming sterile.
Which factor in nature causes discontinuous Variation in a population ?
Discontinuous variation in a population is primarily caused by mutations. Mutations introduce new genetic variations that can lead to distinct phenotypic changes, which do not follow a continuous range but appear as distinct categories.
This is reversal of mutation
A back mutation, or reversion mutation, is a genetic change that reverses the effect of a previous mutation. This type of mutation restores the original sequence of DNA, thus reversing the mutation.
State the cause of Philadelphia syndrome
What happens to excessive phenylalanine accumulation in the blood of phenylketonuria patient ?
In patients with phenylketonuria (PKU), excessive phenylalanine accumulates in the blood and is converted to phenylketones, which are then excreted in the urine. This is a diagnostic feature of PKU.
Name the enzyme needed for the following biochemical reaction Tyrosine Melanin
The enzyme needed for the conversion of Tyrosine to Melanin is Tyrosinase. Tyrosinase is a crucial enzyme in the pathway of melanin synthesis. It catalyzes the oxidation of tyrosine to dihydroxyphenylalanine (DOPA) and subsequently to DOPAquinone, which eventually leads to the formation of melanin.
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