A3.1. Diversity of organisms

Outline the binomial system of classification.

Outline the binomial system of classification.

Outline the binomial system of classification.

Describe the changes that occur in gene pools during speciation.

Describe the changes that occur in gene pools during speciation.

Describe the changes that occur in gene pools during speciation.

A pregnant woman had fetal cells removed by chorionic villus sampling and tested. The following karyogram was produced.

[Source: Mediscan / Alamy Stock Photo]

What does this show?

A. The child is female with Down syndrome.

B. The child is female without Down syndrome.

C. The child is male with Down syndrome.

D. The child is male without Down syndrome.

Outline how sex is determined in humans.

The image shows a human karyogram.

^{National Cancer Institute, 1997. Karyotype. [diagram online]
Available at: https://commons.wikimedia.org/wiki/
File:Karyotype_(normal).jpg [Accessed 14 February 2022]. Public domain.}

From which person was the karyogram obtained?

A.  A female with Down syndrome

B.  A female without Down syndrome

C.  A male with Down syndrome

D.  A male without Down syndrome

Outline how sex is determined in humans.

A pregnant woman had fetal cells removed by chorionic villus sampling and tested. The following karyogram was produced.

[Source: Mediscan / Alamy Stock Photo]

What does this show?

A. The child is female with Down syndrome.

B. The child is female without Down syndrome.

C. The child is male with Down syndrome.

D. The child is male without Down syndrome.

Outline how sex is determined in humans.

Outline how sex is determined in humans.

The image shows a human karyogram.

^{National Cancer Institute, 1997. Karyotype. [diagram online]
Available at: https://commons.wikimedia.org/wiki/
File:Karyotype_(normal).jpg [Accessed 14 February 2022]. Public domain.}

From which person was the karyogram obtained?

A.  A female with Down syndrome

B.  A female without Down syndrome

C.  A male with Down syndrome

D.  A male without Down syndrome

The scattergraph shows the genome sizes of four Enterococcus species.

^{[Source: Lebreton, F., Manson, A.L., Saavedra, J.T., Straub, T.J., Earl, A.M. and Gilmore, M.S., 2017.
Tracing the Enterococci from Paleozoic Origins to the Hospital (Figure 1A).
Cell, [e-journal] 169(5), pp. 849–861. http://dx.doi.org/10.1016/j. cell.2017.04.027.]}

What can be concluded about the genomes in Enterococcus?

A.  E. pallens has the greatest number of genes.

B.  E. faecalis and E. faecium have the same mean number of genes.

C.  The total genetic information in Enterococcus is constant within each species.

D.  E. columbae has more DNA than E. faecium.

The scattergraph shows the genome sizes of four Enterococcus species.

^{[Source: Lebreton, F., Manson, A.L., Saavedra, J.T., Straub, T.J., Earl, A.M. and Gilmore, M.S., 2017.
Tracing the Enterococci from Paleozoic Origins to the Hospital (Figure 1A).
Cell, [e-journal] 169(5), pp. 849–861. http://dx.doi.org/10.1016/j. cell.2017.04.027.]}

What can be concluded about the genomes in Enterococcus?

A.  E. pallens has the greatest number of genes.

B.  E. faecalis and E. faecium have the same mean number of genes.

C.  The total genetic information in Enterococcus is constant within each species.

D.  E. columbae has more DNA than E. faecium.