Question

question #11
the gender of an american alligator is determined by the temperature at which the egg incubates. a temperature of 34°c and higher produces male offspring, while a temperature closer to 30°c produces female offspring.
which statement best explains gender determination in american alligator offspring?
a the gender of the offspring is determined to keep up from \turnover\ of males and females in the american alligator population.
b the gender of the offspring is determined to ensure a large number of female tortoises in the american alligator population.
c the gender of the offspring is determined as a result of environmental and not genetic factors.
d the gender of the offspring is determined as a result of genetic and not environmental factors.

Explanation:

Question (First one, about offspring with short hair)

To determine why parents can have short - hair offspring, we analyze the options:

• Option A: If each offspring receives one gene from each parent, different combinations of genes (even if parents have long - hair - related genes) can result in short - hair traits. For example, if the hair length trait is controlled by genes, and parents are heterozygous (carry both short and long - hair genes), the combination of recessive short - hair genes from both parents can lead to short - hair offspring.
• Option B: If each offspring gets one chromosome from each parent, chromosomes carry multiple genes. But the key for hair length is gene combination, not just chromosome inheritance in a way that this option explains short - hair offspring.
• Option C: Offspring do inherit alleles from parents, so this option is incorrect.
• Option D: Offspring do inherit traits from parents, so this option is incorrect.

The gender of American alligator offspring is determined by the temperature of the egg (an environmental factor) and also has a genetic basis (since the species has genetic information that interacts with the environment for gender determination).

• Option A: There's no indication that gender is determined to maintain a 50 - 50 male - female ratio.
• Option B: There's no evidence that gender is determined to ensure a large number of female alligators.
• Option C: The gender is determined by environmental (temperature) and genetic factors. The temperature of the egg (environmental) affects gender, and the alligator has genetic information that responds to temperature for gender development.
• Option D: The gender is determined by both genetic and environmental factors, so this option (saying not environmental) is incorrect.

Answer:

A. Each offspring receives one gene from each parent.

Question #17 (American alligator gender determination)