Question

In chickens, a large comb is dominant over a small comb. The gene for comb size is located on an autosome and large combs are inherited in an autosomal dominant fashion. However, roughly 10% of chickens that have the large comb allele nevertheless have a small comb. This is an example of...

		Codominance
		Incomplete Penetrance
		Variable Expressivity
		Pleiotropy
		Complete Penetrance

Which of Mendel's Laws refers to the events in Metaphase I of meiosis?

		Law of Independent Assortment
		Law of Segregation
		Law of Pairwise Alignment
		Law of Randomization

A woman with type A blood has a baby with a man who has type B blood. What are the possible blood types of the baby?

SELECT ALL THAT APPLY but be aware that incorrect answers count against you.

		Type C
		Type AB
		Type O
		Type A
		Type B
		None of the above

In birds, blue feather color is dominant to yellow feather color, long beaks are dominant to short beaks, and

noisy is dominant to quiet.

On your own paper, draw a forked-line diagram of the cross BbLlNn x bbLlNn and use it to match the phenotypes below to their expected frequencies.The same frequency may be chosen more than once and some frequencies may not occur at all.

-       A.       B.       C.       D.       E.       F.       G.       H.       I.    B_L_N_       -       A.       B.       C.       D.       E.       F.       G.       H.       I.    B_ ll N_       -       A.       B.       C.       D.       E.       F.       G.       H.       I.    bbL_N_       -       A.       B.       C.       D.       E.       F.       G.       H.       I.    B_ll nn       -       A.       B.       C.       D.       E.       F.       G.       H.       I.    bb ll nn       -       A.       B.       C.       D.       E.       F.       G.       H.       I.    bb L_nn

A. 1/4 B. 9/64 C. 1/32 D. 1/64 E. 3/16 F. 3/64 G. 3/32 H. 9/32 I. 1/16

Answer 1

1. Incomplete penetrance

According to the question, large allele is dominant over small allele. But still 10% of the progeny with large allele have small comb. It is because of incomplete penetrance of the large allele. Because of incomplete penetrance, the trait is not able to express itself completely in a given population.

Codominance is the type of inheritance in which two alleles are equally dominant over one another and therefore express equally. In heterozygotes, a variegated phenotype is obtained.

Pleiotropy is the condition in which one gene controls many phenotypes.

2. Law of independent assortment

According to the law of independent assortment, the alleles of different genes assort independently of each other during gamete formation so that every gamete receive one allele of a gene.

According to the law of segregation, alleles of a given gene separate independently of each other so that every gamete receives one allele of a gene.

According to the only first question can be answered.

Please give a good rating.