NEET BIOLOGY

GENETICS AND EVOLUTION

INHERITANCE AND VARIATION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
An alligator has 32 chromosomes in each of the cells of its nose. How many chromosomes will an alligator zygote contain?
A
16
B
32
C
46
D
64
Explanation: 

Detailed explanation-1: -Hence, if the liver cells have 32 chromosomes, then it can be represented as 2n=32 and the sperm cells will be n=16.

Detailed explanation-2: -The chromosome number in Alligatoridae (Alligator 2n = 32, and Caiman, Melanosuchus, and Paleosuchus 2n = 42) is more varied than in Crocodylidae (Gavialis and Tomistoma 2n = 32, Mecistops 2n = 30, Osteolaemus 2n = 38, Crocodylus 2n = 30 34).

Detailed explanation-3: -Like the American alligator, the gharial has 16 chromosomes [54]. Unlike organisms with genetic sex-determination systems, crocodilians are not thought to have sex chromosomes [54]. Instead sex is determined by incubation temperature of the egg [42].

Detailed explanation-4: -Explanation: So in an animal with 32 (2n) chromosomes in somatic cell, number of chromosomes in sperm will be 16 (n).

Detailed explanation-5: -Of the 23 chromosomes in human spermatozoa, chromosomes 13, 18, 21, X, and Y are important because higher incidence of abnormalities in these chromosomes can to lead miscarriages or live births (Pang et al., 1999, 2005, 2010; Rubio et al., 2001).

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