Ch. 14 AP BIOOOOOO

Height in humans generally shows a normal (bell-shaped) distribution. What type of inheritance most likely determines height?

A combination of polygenic inheritance and environmental factors

Part A) A black guinea pig crossed with an albino guinea pig produces 12 black offspring. When the albino is crossed with a second black one, 7 blacks and 5 albinos are obtained. Part B) What are the genotypes of the parents in the first cross (the cross that produced 12 black offspring)? Part C) What are the genotypes of the gametes and offspring in the first cross? Part D) What are the genotypes of the parents in the second cross (the cross that produced 7 black and 5 albino offspring)? Part E) What are the genotypes of the gametes and offspring in the second cross?

Albino (b) is a recessive trait; black (B) is a dominant trait. BB x bb gametes: B and b; offspring: all Bb Bb x bb gametes: 1/2 B and 1/2 b (heterozygous parent) and b; offspring: 1/2 Bb and 1/2 bb

Select the correct explanation for the fact that a carrier of a recessive genetic disorder does not have the disorder.

In a recessive disorder, only a single functioning allele is necessary to determine a normal phenotype.

Consider pea plants with the genotypes GgTt and ggtt . These plants can each produce how many type(s) of gametes?

Four ... one

Which of the following do you expect if an individual is heterozygous for the sickle-cell trait?

He or she will show some symptoms of the disease.

In his breeding experiments, Mendel first crossed true-breeding plants to produce a second generation, which were then allowed to self-pollinate to generate the offspring. How do we name these three generations?

P ... F1 ... F2

Look at the Punnett square, which shows the predicted offspring of the F2 generation from a cross between a plant with yellow-round seeds (YYRR) and a plant with green-wrinkled seeds (yyrr). Select the correct statement about wrinkled yellow seeds in the F2 generation.

The chance that an individual taken at random from the F2 generation produces wrinkled seeds is 25% and the chance that the same individual produces yellow seeds is 75%.

When a dominant allele coexists with a recessive allele in a heterozygote individual, how do they interact with each other?

They do not interact at all

What is an allele

an alternative version of a gene