1.1 Which famous scientist broke the code of the DNA molecule and concluded that DNA is a helix? A - NSC Life Sciences - Question 1 - 2024 - Paper 2

The number of chromosomes undergoing mitosis is essential for understanding cell division. In humans, this number is 46, resulting from 23 pairs of chromosomes. During mitosis, each chromosome is duplicated, ensuring that each daughter cell receives the same genetic material.

In the inheritance of blood groups, there are four phenotypes determined by the alleles A, B, AB, and O. This inheritance pattern illustrates codominance, where both A and B are expressed in individuals with AB blood type.

Only statement A is particularly related to cell division costs in maintaining genetic variation in a population. The processes of chromosome segregation during cell division are critical for genetic stability.

1. DNA profiling
2. Punctuated equilibrium
3. Cloning
4. Stem cells
5. Color blindness
6. Anther/pollen sac
7. Centromere.

The nucleotide acid shown in diagram 1 is likely DNA, characterized by its double helix structure.

The type of sugar found in DNA is deoxyribose.

Typically, a nucleotide has four components: a phosphate group, a sugar, and two nitrogenous bases. In structural diagrams, this is represented to show bonding with carbon and nitrogen.

Two species that existed at the same time as H. neanderthalensis are Homo sapiens and Homo erectus.

The diagram shown is likely a phylogenetic tree, which depicts evolutionary relationships among various species.

The genus that gave rise to Australopithecus is likely Ardipithecus, which is a significant ancestor in human evolution.

The letter indicating the most recent common ancestor for both species may be labeled as 'C' in a cladogram.

In humans, normal gametes are haploid, meaning they contain one set of chromosomes, either 23 chromosomes, representing either male (X) or female (Y) contributions.

The type of mutation that could occur during gamete production is a chromosomal mutation, which may involve duplications, deletions or inversions of chromosomal segments.

This would require specific reference to the visual panel to provide an accurate count of features or organisms depicted.

The sex chromosomes of the offspring can be represented as either XX for females or XY for males, depending on the combination contributed by each parent.

One famous example of an Australopithecus fossil found in South Africa is 'Little Foot,' a nearly complete skeleton found in the Sterkfontein caves.