A cross has been set up between a true breeding tall plant producing white flowe

Question

A cross has been set up between a true breeding tall plant producing white flowers and a true breeding short plant producing red flowers. One can be certain that this type of a cross: a) will result in a 3 red: 1 white ratio b) will result in all red F1 flowers c) cannot produce progeny because the parental phenotypes are different from one another d) is a monohybrid cross e) is a dihybrid cross In humans, free earlobes (E) arc dominant to attached earlobes (e). If a heterozygous individual males with an individual with attached earlobes, what proportion of their progeny is expected to have free carlobes? a)0% b) 25% c) 50% d)75% c) 100% How many Barr bodies do you expect to find in somatic cells of (1) a healthy male and (2) an individual v 47. XXX. a) 1, 3 b)0, 1 c) 2, 3 d)1, 2 e)0.2 A person with 47, XX +21 represents an example of a) monosomy b)triploid c) polyploidy c)aneuploidy d)euploidy When mating flies, virgin females arc distinguished by their ____. A) Pointed bottoms, sex combs B) Colorless under belly, dark spot C) Round bottom, sex combs D) Colored body, darks spots E) None of the above Flies do not mate for at least_ hours after they emerge from the pupae cases. A) 10 B) 8 C) 5 D) 6 E) 2

Explanation / Answer

Answer:

12. (e) is a dihybrid cross

The cross involves two traits: height (tall or short) and flower color (white or red). So, its a dihybrid cross.

13. (c) 50%

Parents: Ee * ee

F1: Ee : ee = 1 : 1

14. (e) 0, 2

Healthy male will ot have any barr body since it possess only one X chromosome.

47+XXX will contains 2 barr bodies since only one will be functinally active due to dosage compensation.

15. (c) Aneuploidy

Trisomy 21 (Down's syndrome) is an example of aneuploidy.

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.