Day 14 SURVIVOR Warm Up

Giant salvinia is a floating fern native to Brazil introduced to Texas as an aquarium plant and is now found in large bodies of water across the state. The invasive plant may be carried to new bodies of water by fishing and recreational boats. It grows quickly, covering large areas of the water's surface. When the plant dies and decomposes, the oxygen content in the water declines. Which statement best describes how giant salvinia affects a Texas ecosystem?

A scientist examined two populations of the grasshopper species Atractomorpha lata. The scientist found that the population raised in higher temperatures had a higher frequency of brown coloration, while the population raised in lower temperatures had a higher frequency of green coloration.

Based on this information, which biological process is affected by temperature in A. lata?

A student observed a human cheek cell under a light microscope and made these observations:

• The chromatin is condensed

• There is no visible nucleolus

• The spindle fibers are visible

• The nuclear membrane looks like it is disappearing

What phase of the cell cycle is this student MOST LIKELY observing?

Cystic Fibrosis is an autosomal recessive disorder in humans. What is the probability that an offspring will have cystic fibrosis if both parents are carriers of cystic fibrosis? Answer with the correct percentage using the number only.

The bar graph shows the average beak depth (distance from the top of the beak to the bottom) of a population of finches. The data were collected in 1976 and in 1978, after a drought occurred in 1977 in the area.

Which factor best describes the change is this population of finches?