NEET BIOLOGY

GENETICS AND EVOLUTION

GENETIC BASIS OF INHERITANCE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Each species has a specific identifying number of chromosomes. For example, a cat, Felis catus, has 38 chromosomes, while corn, Zea mays, has 20 chromosomes. Each chromosome carries
A
the same genes as all of the other chromosomes in the set
B
. specific genes that are unique to that chromosome.
C
an enzyme helicase that binds the chromosome when it breaks.
D
identical DNA and RNA that was received from the parents.
Explanation: 

Detailed explanation-1: -Domestic cats have 38 chromosomes, including 18 autosomal pairs and the sex chromosomes, X and Y. This karyotype depicts a female cat and therefore has two X chromosomes.

Detailed explanation-2: -In humans, each cell normally contains 23 pairs of chromosomes, for a total of 46. Twenty-two of these pairs, called autosomes, look the same in both males and females. The 23rd pair, the sex chromosomes, differ between males and females.

Detailed explanation-3: -Law of Segregation. Observing that true-breeding pea plants with contrasting traits gave rise to F1 generations that all expressed the dominant trait and F2 generations that expressed the dominant and recessive traits in a 3:1 ratio, Mendel proposed the law of segregation.

Detailed explanation-4: -A genome is all the hereditary information-all the genes-of an organism.

There is 1 question to complete.