A short pea plant is crossed with a tall, heterozygous pea plant. Use a Punnett square to determine the probability of short offspring.(1 point)

Question

A short pea plant is crossed with a tall, heterozygous pea plant. Use a Punnett square to determine the probability of short offspring.(1 point)
Responses

75%
75% - no response given

50%
50% - no response given

25%
25% - incorrect

0%

GPT-4o mini · Answer

To determine the probability of short offspring when crossing a short pea plant with a tall heterozygous pea plant using a Punnett square, we first need to define the genotypes involved:

Let "T" represent the allele for tall (dominant).
Let "t" represent the allele for short (recessive).

The short pea plant has the genotype "tt," and the tall, heterozygous pea plant has the genotype "Tt."

Set up the Punnett square:

| | T | t | |------|----|----| | t| Tt | tt | | t| Tt | tt |

Analyze the Punnett square:

The offspring genotypes are:
- 2 Tt (tall)
- 2 tt (short)

Probability of short offspring:

There are a total of 4 boxes in the Punnett square.
Out of these, 2 boxes represent short offspring (tt).

Probability of short offspring = Number of short offspring / Total offspring = 2 / 4 = 50%.

Thus, the correct response is 50%.

Answer

Traits can be affected by one gene and can be influenced by the environment.

Human blood types are controlled by two non-Mendelian patterns of inheritance. These two patterns are

(1 point)
Responses

epistasis and polygenic inheritance
epistasis and polygenic inheritance

codominance and polygenic inheritance
codominance and polygenic inheritance

multiple alleles and epistasis
multiple alleles and epistasis

codominance and multiple alleles

GPT-4o mini · Answer

Human blood types are controlled by **codominance** and **multiple alleles**. - **Multiple alleles** refer to the existence of more than two alleles for a genetic trait, as seen in blood types A, B, AB, and O, which are determined by the presence of the alleles $ I^A $, $ I^B $, and $ i $. - **Codominance** occurs when both alleles (e.g., $ I^A $ and $ I^B $) are expressed equally in the phenotype, which is seen in the AB blood type where both A and B antigens are present on red blood cells. Thus, the correct response is **codominance and multiple alleles**.

Answer

Human blood has four phenotypes: A, B, AB, and O. The genes for A and B are dominant, while O is recessive. If a person has AB blood type, what inheritance pattern is demonstrated?(1 point)
Responses

epistasis
epistasis

incomplete dominance
incomplete dominance

polygenic traits
polygenic traits

codominance
codominance

GPT-4o mini · Answer

If a person has AB blood type, the inheritance pattern demonstrated is codominance.

In codominance, both alleles (in this case, $ I^A $ and $ I^B $) are expressed fully and equally in the phenotype. In the case of blood type AB, both A and B antigens are present on the surface of red blood cells.

Thus, the correct response is codominance.

Answer

A tall pea plant is crossed with a short pea plant. Half the offspring are tall and half are short. How would you designate the allele for tallness?(1 point) Responses Tt Tt TT TT tt tt T

GPT-4o mini · Answer

In this scenario, where a tall pea plant is crossed with a short pea plant and half the offspring are tall and half are short, the allele for tallness must be the dominant allele.

Since the offspring show a 1:1 ratio of tall to short plants, we can infer that the tall parent must be heterozygous (Tt) and the short parent is homozygous recessive (tt). Therefore, the dominant allele for tallness is designated as T.

Thus, the correct response is T.