LIFSCI 7B XL EXAM PACKAGE DEAL 2024

A normal female who carries a recessive X-linked allele for hemophilia will pass it on to: - Half of both her sons and daughters. Color blindness is a recessive X-linked trait in humans. In a family where the mother is color-blind and the father is normal, the probability of their having a color-...

How do most cancers arise? - From a series of mutations that arise in the descendants of a single somatic cell How do mutations arise? - Mutations arise randomly and independent of other mutations in the cell Mutations arise in which order in the colon cancer example shown in the animation? - AP...

A cattle breeder selects the largest males for breeding with the largest females. This is an example of: - Directional selection Female starlings (birds) that lay clutches of four or five eggs have more surviving young than those with either larger or smaller clutches. This is an example of: - St...

In the figure above, which lettered item is a centromere? - D In the figure above, which lettered item is a centrosome? - A In the figure above, which lettered item is a chromatid? - E In the figure above, which lettered item is a chromosome? - C The contractile ring that leads to cytokinesis in...

Analysis of air bubbles in different layers of ice from the Vostok Glacier indicates that the amount of carbon dioxide in Earth's atmosphere has cycled over geologic time between: - 180 and 285 ppm Recent (2016) atmospheric CO2 measurements at the observatory at Mauna Loa, Hawaii have reached 40...

During DNA replication occasional errors can occur resulting in a change in a nucleotide base, for example instead of adding a T, a C is added. If this is not corrected by mismatch repair or other mechanisms, this change represents a: - Mutation Females of a species of parasitic wasps locate thei...

A phylogenetic tree is a hypothesis about the evolutionary relationships among organisms based on available anatomical and/or molecular data. True or False? - True Refer to the phylogenetic tree above. The grouping that includes Salamanders and Caecilians is: - Paraphyletic. Refer to the phyloge...

If all variation in height among humans was due to environmental influences alone, the mean height of offspring when graphed against the mean height of parents should be closest to which line in the graph above? - The population mean line The actual offspring mean height in the graph lies between...

During meiosis crossing over takes place between: - Non-sister chromatids In the figure above, which box contains only single gene copies from one of the parents? - Box A In the figure above, which box contains some gene variants (alleles) from one parent and some from the other, but not variant ...

Nitrogen fertilizer is added to farmland to improve crop yield and quality. While farmers are working to reduce the amount of runoff from fields, some of the fertilizer enters streams. The streams flow into the Mississippi River and ultimately into the Gulf of Mexico where the added nitrogen suppo...

Estimates are that all natural processes (not including human activities) result in a near balance between carbon entering and leaving the atmosphere (actually slightly less entering than leaving). What is the estimate of the EXCESS CO2 in gigatons of carbon per year added to the atmosphere from h...

For an individual who is heterozygous for two genes, Aa and Bb, what does independent assortment predict? - Offspring inheriting the dominant (A) allele of the first gene are equally likely to inherit either the dominant (B) or the recessive (b) allele of the second gene. How did Mendel make cros...

A node on the phylogenetic tree indicates: - A branch point and common ancestor. In the phylogenetic tree above (given), A indicates: - The root In the phylogenetic tree above, which of the following could be considered a sister group? - B Of the taxa listed on the phylogeny, which is more closel...

A similar study to the one illustrated in Fig 22.7 is carried out on these six species of Beteus. We sequence 10,000 bp of DNA from multiple loci in each species and compare the number of base pair differences between each species pair (A compared to B, C compared to D, E compared to F). Rank the ...